REPO’s co-op chaos is clearly designed around tight coordination, limited resources, and the constant pressure of things going wrong fast. That design philosophy shows up immediately the moment you host a lobby and realize the game draws a hard line on how many players can join. Before touching mods or config files, it’s critical to understand what the game actually allows out of the box and why that limit exists.
The native player cap in vanilla REPO
By default, REPO supports a maximum of four players per lobby. That includes the host, meaning you can invite up to three additional friends without any modifications. There are no hidden settings, Steam launch options, or in-game toggles that let you push past this limit natively.
This cap is enforced at the matchmaking and networking layer, not just the UI. Even if you try to brute-force invites through Steam or join via friend codes, the game will reject extra connections once the fourth slot is filled.
Why the game is locked to four players
REPO’s core mechanics are tightly balanced around a four-player squad. Enemy spawns, aggro logic, objective scaling, and even room layouts assume a small team where positioning and communication matter. Adding more bodies would trivialize certain encounters while completely breaking others.
Performance is another major factor. REPO runs a lot of real-time simulation under the hood, especially with physics-driven interactions and AI behavior. The four-player limit helps keep latency, desync, and hitbox weirdness under control during high-stress moments.
No official support for larger lobbies
As of the current Steam build, the developers do not offer any official support for increasing lobby size. There’s no roadmap feature, experimental branch, or accessibility option that hints at larger co-op groups being planned.
That means any attempt to go beyond four players immediately leaves the realm of intended gameplay. From this point on, you’re relying entirely on community-made solutions that hook into REPO’s systems in ways the game was never balanced for.
What this means for hosts with big friend groups
If you’re hosting and sticking strictly to vanilla REPO, four players is the absolute ceiling. No exceptions, no clever workarounds, and no safe exploits. Anyone telling you otherwise without mentioning mods is either mistaken or playing a different build entirely.
The good news is that REPO’s modding scene has already found ways around this limitation. The bad news is that once you cross that line, you’re trading stability, balance, and sometimes performance for sheer player count, and that’s a trade you need to understand before moving forward.
Can You Increase Lobby Size in REPO? (Official Support vs Modded Solutions)
At this point, the line between vanilla REPO and modded REPO needs to be crystal clear. The game itself hard-locks you to four players, and nothing inside the official client lets you push past that. If you want bigger squads, you are stepping fully into community-made territory.
That doesn’t mean it’s impossible. It just means the rules change, and as host, you’re responsible for keeping everything stable.
Official answer: No, REPO does not support larger lobbies
There is no setting, launch option, Steam beta branch, or config file that increases lobby size in unmodded REPO. The four-player cap is enforced server-side and client-side, so even modified UI elements won’t bypass it.
From a developer standpoint, this makes sense. Core systems like enemy targeting, objective pacing, and physics interactions are tuned around four simultaneous players. The moment a fifth connects, those assumptions collapse, which is why the game blocks it outright.
If you want a larger lobby without mods, the short answer is simple: you can’t.
Modded solution: Community lobby size mods
The only way to increase lobby size in REPO is by installing mods that hook into the game’s networking and lobby management systems. These mods override the hardcoded player cap and allow additional clients to connect beyond the fourth slot.
Most of these solutions are built around common PC modding frameworks like BepInEx, which injects custom code at runtime. Once installed, a lobby size mod can raise the cap anywhere from six to ten players, depending on the version and how aggressive you want to be.
This is not a cosmetic tweak. You are fundamentally altering how REPO handles player synchronization, which is why these mods are host-dependent and version-sensitive.
How to install a lobby size mod step by step
First, you’ll need to install BepInEx for REPO. This usually involves downloading the correct x64 build, extracting it into the game’s root folder, and launching the game once to generate config files. If BepInEx isn’t loading, nothing else will work.
Next, download a lobby size or extended multiplayer mod from a trusted community source like Thunderstore. Drop the mod’s DLL files into the BepInEx plugins folder, then relaunch the game.
Once in-game, hosts typically get a config file or in-game menu where they can set the new player cap. After that, players can join via Steam invites or lobby browser, assuming they’re also running the required mod files.
Do all players need the mod installed?
In most cases, yes. While some mods technically allow vanilla clients to connect, this is where desync, invisible players, or broken interactions start to show up. For anything above five players, full mod parity is strongly recommended.
Every player should be running the same mod version, the same game build, and the same mod loader. One mismatched file is enough to cause failed joins, softlocks, or mid-session crashes.
If you’re hosting for a large friend group, sending a mod list and install order ahead of time will save you hours of troubleshooting.
Gameplay and performance trade-offs you need to understand
Increasing lobby size dramatically alters how REPO plays. Enemy aggro can break, objectives can complete faster than intended, and certain encounters lose all tension when eight players dogpile a single target.
Performance also takes a hit. More players means more physics checks, more network traffic, and more chances for latency spikes during chaotic moments. Hosts with weaker CPUs or unstable connections will feel this immediately.
In short, bigger lobbies turn REPO into a different game. It can be chaotic and hilarious, but it’s no longer balanced, and stability becomes something you actively manage rather than take for granted.
Required Tools & Mods for Larger Lobbies (Frameworks, Loaders, and Key Mods)
At this point, it should be clear that bigger lobbies aren’t just a toggle you flip in REPO. You’re effectively rebuilding the game’s multiplayer ruleset, and that starts with the right modding foundation. If even one of these pieces is missing or outdated, you’ll be fighting crashes, failed joins, or hard desyncs all night.
BepInEx: The non-negotiable framework
Everything begins with BepInEx. REPO runs on Unity, and BepInEx is the injection framework that allows mods to hook into the game’s code at runtime. Without it, lobby size mods simply cannot function.
You’ll want the x64 version of BepInEx that matches REPO’s Unity build. Install it directly into the game’s root directory, not a subfolder, then launch the game once to let it generate its config and plugin folders. If the BepInEx console window doesn’t appear on launch, stop here and fix that before doing anything else.
Thunderstore Mod Manager vs manual installs
For players running larger groups, Thunderstore Mod Manager is strongly recommended. It handles dependencies automatically, enforces version matching, and makes sharing mod profiles with friends painless. This alone eliminates a huge percentage of multiplayer issues.
Manual installs still work if you know what you’re doing. You’ll be dropping DLL files into the BepInEx/plugins folder and managing updates yourself. The trade-off is full control versus higher risk of mismatched versions across your group.
Lobby size and extended multiplayer mods
This is the mod that actually lifts REPO’s player cap. Depending on the current community build, these are often labeled something like extended lobby, more players, or lobby expansion. Functionally, they override the hardcoded max player value and adjust how the game registers connected clients.
Most of these mods expose a config file after first launch. Hosts can set the new max player count there, usually anywhere from six to twelve players, though stability drops fast as you push higher. Just because a mod lets you set sixteen doesn’t mean REPO can survive it.
Networking and sync dependencies you shouldn’t skip
Some lobby mods rely on additional networking libraries to keep clients synchronized. These might not advertise themselves as “required,” but skipping them is how you end up with invisible players, broken hitboxes, or enemies only one person can see.
Always read the dependency list on the mod page and install everything listed. If a mod requires a specific networking helper or API extension, every single player needs it, not just the host. Multiplayer instability almost always traces back to missing dependencies.
Optional quality-of-life mods for large groups
Once you’re above five players, REPO’s default UI and systems start to strain. Player nameplates overlap, voice chat can become chaos, and tracking objectives turns messy fast. This is where optional QoL mods become borderline essential.
Common additions include enhanced HUD mods, improved voice indicators, and player list extensions that properly display everyone in the lobby. These don’t increase the player cap themselves, but they make large lobbies playable instead of overwhelming.
Version locking and compatibility management
Large lobbies amplify compatibility problems. A minor game update, a silent mod patch, or one player forgetting to update can break the entire session. This is why version locking matters.
If you’re hosting regularly, freeze your mod list on a known-working setup and only update when the entire group is ready. Using a shared Thunderstore profile or a written install order prevents the classic “it works on my machine” multiplayer nightmare.
Step-by-Step: Installing and Configuring a Lobby Size Mod
With version locking and dependencies handled, it’s time to actually increase REPO’s lobby cap. The process isn’t complicated, but small mistakes here can cause desyncs, failed connections, or outright crashes once more players start joining. Follow these steps in order, and don’t skip the verification checks.
Step 1: Install a mod loader (Thunderstore or manual)
REPO lobby size mods almost always run through a mod loader, most commonly Thunderstore with a BepInEx backend. If you’re already using mods, you can skip this, but first-time hosts need a clean setup.
Using Thunderstore Mod Manager is the safest route. Select REPO, create a new profile, and let it install BepInEx automatically. Manual installs work too, but they increase the risk of mismatched folders or outdated files when playing with a group.
Step 2: Download a verified lobby size mod
Inside Thunderstore, search for a lobby size or player cap mod with recent updates and active comments. Avoid anything that hasn’t been touched since early access builds, as REPO’s networking has changed over time.
Before installing, check the mod’s description for hard limits. Many mods advertise extreme player counts, but most stable setups sit between six and eight players. Treat anything above that as experimental, not guaranteed.
Step 3: Install required dependencies for all players
This is where most failed lobbies are born. If the lobby mod lists networking helpers, API extensions, or sync libraries, install every single one.
Every player joining your lobby must have the same dependencies enabled. If even one client is missing a required library, expect invisible players, delayed damage registration, or enemies snapping between positions like bad rollback netcode.
Step 4: Launch the game once to generate config files
After installing the mod and its dependencies, launch REPO one time and reach the main menu. This initial boot creates the config files you’ll need to edit.
Do not invite anyone yet. Changing player limits mid-session or before the config exists can corrupt the file and force a reinstall.
Step 5: Configure the max player count
Navigate to the mod’s config file, usually found in the BepInEx config folder or accessible directly through Thunderstore’s config editor. Look for entries like MaxPlayers or LobbySize.
Set a realistic number. Six is usually rock-solid, eight is workable with minor hiccups, and anything beyond that starts taxing enemy AI, physics sync, and hitbox consistency. Remember that REPO was not balanced for MMO-style chaos.
Step 6: Sync configs across your group
While some mods only require the host to set the player cap, mismatched configs can still cause warnings or failed joins. For safety, have everyone mirror the same config values.
Sharing a Thunderstore profile code is the cleanest method. It guarantees identical mod versions, configs, and load order, which is critical once you’re pushing the game beyond its intended limits.
Step 7: Host and stress-test the lobby
Start a private lobby first and invite players gradually. Watch for warning signs like delayed spawns, rubberbanding enemies, or players losing collision during combat.
If issues appear, lower the player count by one and retest. In REPO, stability scales non-linearly, and removing a single player can be the difference between smooth co-op and a broken run with desynced aggro and phantom damage.
Hosting Large Lobbies Safely (Steam Settings, Host Authority, and Sync Rules)
Once your stress test looks stable, the next challenge is keeping that oversized lobby functional once a real run starts. This is where most large REPO lobbies fall apart, not because of bad mods, but because the host setup and sync rules aren’t respected.
REPO’s netcode assumes a small, tightly synced group. When you push past the default cap, you need to compensate manually using Steam’s backend options and disciplined hosting habits.
Lock Down Steam Networking Settings
Before you host, open Steam and head to Settings, then In-Game and Downloads. Make sure Steam Overlay is enabled and download region matches the majority of your group to reduce relay hopping.
More importantly, under Steam’s networking settings, disable any experimental or beta networking features. These can introduce unpredictable latency spikes that barely matter in four-player lobbies but become brutal when eight players are all syncing AI, physics objects, and hit reactions simultaneously.
If you’re hosting from Wi-Fi, stop here and fix that first. Large REPO lobbies demand a wired connection, or you’ll see delayed enemy aggro swaps and damage registering a full second late.
Understand Host Authority and Why It Matters
REPO uses a host-authoritative model. That means the host decides enemy behavior, hit confirmation, physics resolution, and mission progression.
With more players, the host’s CPU becomes the bottleneck, not individual clients. If the host machine is underpowered, clients will experience rubberbanding enemies, missed I-frames, and projectiles snapping mid-flight even if their own FPS is perfect.
The golden rule is simple: the strongest PC hosts. High single-core performance matters more than GPU power here, because AI logic and sync calculations scale aggressively with player count.
Never Transfer Host Mid-Session
In vanilla REPO, host migration is already risky. With expanded lobbies, it’s a guaranteed run killer.
If the host disconnects or alt-F4s, remaining players often desync permanently. Enemies may stop targeting correctly, objectives fail to update, or players lose collision entirely.
If the host needs to leave, end the session cleanly and rehost. It’s slower, but it prevents corrupted runs and broken save states that can persist across sessions.
Enforce Strict Mod and Config Sync Rules
Once you’re running more than the intended player count, “close enough” mod setups are not close enough anymore. Even cosmetic or UI-only mods can introduce version mismatches that destabilize sync.
Every player should launch REPO through the same Thunderstore profile. Do not allow manual installs or “I think it’s the same version” guesses.
If someone crashes, have them relaunch through the profile and rejoin. Do not hot-swap mods or tweak configs while the lobby is open, as REPO does not resync these values dynamically.
Control Join Timing and Player Actions
Large lobbies amplify chaos during join-in-progress moments. The safest approach is to only allow joins while in the hub or between mission transitions.
Avoid letting players join during combat or scripted sequences. That’s when enemy AI states are most fragile, and adding a new client can cause aggro tables to reset or enemies to freeze in place.
Once the run starts, ask players to avoid rapid menu toggling, repeated emotes, or spamming physics-heavy actions. These seem harmless, but multiplied across eight players, they can flood the sync queue and destabilize the session.
Accept the Trade-Offs of Going Big
Even with perfect settings, larger REPO lobbies are a compromise. Enemy behavior becomes less predictable, difficulty scaling gets weird, and some encounters lose their intended pacing.
You gain social chaos and spectacle, but you lose balance precision. If your group understands that and treats stability as part of the challenge, large lobbies can be wildly fun instead of endlessly frustrating.
Just remember: every extra player is a stress test. Host smart, sync everything, and respect the limits you’re pushing past.
Compatibility Considerations (Mod Parity, Version Mismatch, and Update Risks)
Once you push REPO beyond its intended player cap, compatibility stops being a background concern and becomes the entire game. Most lobby size mods hook directly into networking, player initialization, and spawn logic. That means even minor mismatches can ripple outward into desyncs, softlocks, or crashes that only appear 20 minutes into a run.
This is where most large-lobby attempts fail, not because the mod doesn’t work, but because the group doesn’t treat parity and version control as non-negotiable.
Mod Parity Is Mandatory, Not Optional
Every player in the lobby must be running the exact same mod list, in the exact same order, with the exact same config values. This includes dependency mods like BepInEx and shared libraries that don’t seem gameplay-related at first glance.
A single mismatched DLL can cause subtle issues like missing hitboxes, invisible players, or abilities failing to register. These bugs often don’t trigger an immediate crash, which makes them harder to diagnose once the run is already compromised.
The safest approach is to distribute a Thunderstore profile and treat it as read-only. If someone wants to experiment, they do it in a separate profile, not in the live lobby.
Version Mismatch Will Break Lobbies in Non-Obvious Ways
REPO is especially sensitive to version mismatches when it comes to player count mods. If one player is on an older mod build that supports six players while the host is running eight, the game may still let them join, but their client will desync during spawn or mission transitions.
You’ll see symptoms like players loading into the wrong map instance, enemies ignoring specific clients, or objective triggers failing to advance. At that point, the run is already dead, even if everyone is technically still connected.
Before hosting, verify that both the game version and all installed mods match exactly. Steam’s auto-update combined with cached mod files is a common culprit here, so force a clean relaunch if anything looks off.
Game Updates Can Instantly Invalidate Lobby Size Mods
Any REPO patch, even a small hotfix, can break lobby expansion mods overnight. These mods often rely on hardcoded values or method hooks that change when player initialization logic is adjusted.
When that happens, the mod may still load without errors, giving a false sense of safety. The actual failure shows up later as infinite loading screens, players spawning without collision, or saves that won’t load afterward.
If REPO updates, assume your large-lobby setup is unsafe until the mod author confirms compatibility. Disable the mod, test vanilla co-op, and only re-enable once an updated build is available.
Cross-Mod Interactions Scale Poorly With Player Count
Mods that behave fine in four-player lobbies can become unstable at six or eight players. Anything that adds AI, modifies enemy targeting, changes physics values, or injects new UI elements increases network traffic per client.
At higher player counts, that extra traffic compounds fast. You may see rubberbanding, delayed damage registration, or AI stalling because the host can’t process all state updates in time.
If stability is the goal, keep your mod list lean. Prioritize the lobby size mod and essential QoL tools, and cut anything that isn’t strictly necessary for the run.
Save Files and Progression Carry Real Risk
Large lobbies increase the chance of corrupted save states, especially if someone disconnects during a scripted event or player-specific progression update. REPO does not always reconcile these states cleanly when extra players are involved.
To protect long-term progression, back up save files before experimenting with expanded lobbies. If a run starts behaving strangely, end it early instead of pushing through and risking persistent corruption.
Think of large-lobby REPO as a custom ruleset, not the default experience. Treat your files and configs accordingly, and you’ll avoid the worst-case scenarios that make people swear off modded co-op entirely.
Performance & Gameplay Trade-Offs with Expanded Player Counts
Once you push REPO beyond its intended player limit, performance stops being a background concern and becomes part of the gameplay equation. Even if the mod loads cleanly and everyone connects, the experience shifts in ways the base game was never tuned to handle.
Understanding these trade-offs upfront lets you decide whether a six- or eight-player lobby is worth the compromises, or if you should scale things back before a run implodes halfway through.
Host-Side CPU and Network Load Increase Exponentially
REPO’s co-op is host-authoritative, meaning the host machine handles AI logic, physics resolution, and state sync for every connected player. Each extra client doesn’t just add linear load; it multiplies the number of interactions the host must process.
At higher player counts, expect frame pacing issues on the host even if their GPU usage looks fine. CPU spikes, delayed enemy reactions, and inconsistent physics are all signs the host is hitting simulation limits, not rendering ones.
A strong CPU and wired internet connection matter far more than raw GPU power once you exceed the default lobby size.
Enemy Behavior and Combat Balance Break Down
Enemy AI in REPO is generally tuned around four-player aggro distribution. With more players, targeting logic can behave erratically, enemies may fixate on a single player, or rapidly swap targets in ways that feel random rather than reactive.
Damage output also skews heavily in favor of players. More bodies means more DPS uptime, more I-frames being rotated, and far less punishment for positioning mistakes. Encounters that were meant to be tense often turn into burst phases where enemies barely get to act.
If you’re looking for balanced difficulty, expanded lobbies will not deliver it without additional difficulty-scaling mods.
Hitboxes, Physics, and Collision Become Unreliable
Physics calculations are one of the first systems to degrade at higher player counts. You may see players clipping into each other, getting pushed by invisible forces, or desyncing slightly during movement-heavy moments.
Hitbox registration can also suffer under load. Melee hits may whiff despite clear contact, while ranged attacks occasionally land late due to delayed state updates. These issues aren’t constant, but when they appear, they directly affect combat feel.
This is especially noticeable in tight spaces where multiple players are interacting with the same physics objects or enemies.
Latency and Desync Affect Moment-to-Moment Play
With six or more players, network traffic increases dramatically. Even on stable connections, this can introduce subtle latency that changes how the game feels moment to moment.
Damage numbers may appear a beat late, enemy stagger reactions can lag behind hits, and revives or interactions may require an extra second to register. None of this usually hard-crashes the run, but it erodes the sense of responsiveness REPO relies on.
If players start talking over each other asking “did that hit?” or “am I lagging?”, you’re already feeling the cost of expanded lobbies.
UI, Audio, and Readability Suffer First
REPO’s UI and audio cues were not designed for large squads. With more players, audio channels overlap constantly, callouts lose clarity, and visual indicators become harder to parse in combat.
Important signals like enemy tells, damage feedback, or player status updates can get buried under noise. This doesn’t just affect immersion; it leads to missed cues and avoidable deaths.
Voice coordination becomes mandatory at higher player counts, because the game itself won’t clearly communicate what’s happening anymore.
Stability Becomes a Session-by-Session Variable
Even if a large lobby works flawlessly one night, there’s no guarantee it will behave the same way in the next session. Memory leaks, long-session instability, and rare desync bugs are more likely the longer you play with expanded player counts.
This is why experienced hosts treat large-lobby REPO as disposable fun rather than progression-focused play. Shorter runs, manual restarts, and frequent re-hosting reduce the odds of catastrophic failure.
Expanded lobbies can be incredible with the right group, but they demand flexibility, patience, and a willingness to accept that the game is operating outside its safe design envelope.
Common Issues, Crashes, and Fixes When Running Large Lobbies
Once you push REPO past its intended player cap, problems stop being theoretical and start becoming very real. Most crashes, soft-locks, and desync issues aren’t random; they follow predictable patterns tied to player count, mod load order, and host-side performance.
Understanding what breaks and why is the difference between a chaotic but playable session and a lobby that implodes mid-run.
Lobby Fails to Start or Players Can’t Join
One of the most common issues is the lobby simply refusing to launch once player slots are expanded. This usually happens when the host and clients aren’t running identical mod versions or when the lobby-size mod loads before a required dependency.
Double-check that every player has the exact same mod list, in the same order, and that no one is missing required frameworks. Even a single mismatched file can cause silent join failures or infinite loading screens.
If the lobby hangs on creation, try reducing the player count by one and relaunching. Many mods have hard breakpoints where stability drops off sharply, especially at odd numbers like seven or nine players.
Mid-Run Crashes and Sudden Desktop Drops
Crashing to desktop during a run is usually memory-related rather than network-based. REPO wasn’t built to track physics, AI, hit detection, and UI updates for large squads simultaneously, and the host machine takes the full brunt of that load.
Long sessions amplify this problem. The longer the run goes, the more likely memory usage creeps upward until the game simply gives up.
The most reliable fix is proactive session management. Restart the lobby every few runs, avoid marathon sessions, and close background applications on the host PC to free up RAM and CPU headroom.
Enemies, Physics, or Interactions Bugging Out
With large lobbies, you’ll eventually see enemies freezing in place, rubberbanding across rooms, or ignoring aggro rules entirely. Physics objects may desync, doors might refuse to open, or interactions fail unless multiple players spam them.
This isn’t a single bug so much as the simulation falling behind. When too many players interact with the same entity, the server struggles to resolve authority cleanly.
Spacing out interactions helps more than you’d expect. Avoid having everyone pile onto the same enemy, terminal, or objective at once, and designate one or two players to handle critical interactions during high-load moments.
Audio Dropouts and Missing UI Elements
Audio cutting out or UI elements disappearing is a known side effect of exceeding REPO’s expected player count. Voice lines may stop playing, health indicators vanish, or player markers fail to update correctly.
These issues rarely crash the game, but they make coordination much harder and increase wipe potential. Unfortunately, there’s no permanent fix.
The best workaround is a quick lobby reload. Leaving and rehosting often restores missing UI and resets audio channels without requiring a full game restart.
Desync That Gets Worse Over Time
If players start seeing different enemy positions, damage numbers that don’t match, or revives that only work for some clients, desync has set in. This tends to snowball the longer the session runs.
At this point, continuing usually makes things worse. Enemy hitboxes become unreliable, I-frames feel inconsistent, and deaths start feeling unfair.
Treat heavy desync as a hard stop. Finish the room if possible, then restart the lobby. Large-lobby REPO rewards knowing when to pull the plug before the run becomes unplayable.
Mod Conflicts After Game Updates
REPO updates can quietly break lobby-size mods overnight. A patch that tweaks matchmaking, UI, or backend systems may invalidate how the mod hooks into the game.
If your previously stable setup suddenly starts crashing after an update, assume the mod is outdated. Check for updates from the mod creator or community Discords before troubleshooting anything else.
Rolling back or waiting for compatibility patches is often faster than trying to brute-force fixes on a broken build.
Knowing When to Scale Back
Not every group needs the maximum possible player count. Many stability issues disappear when dropping from eight players to six, with only a minor hit to the chaos factor.
Finding your group’s sweet spot matters more than chasing the biggest number. A slightly smaller lobby that runs smoothly will almost always be more fun than a massive one that collapses under its own weight.
Large lobbies in REPO are about controlled excess. Push the limits, but respect the warning signs before the game pushes back.
Best Practices for Stable Large-Group Co-op in REPO
Once you’ve accepted that large lobbies push REPO beyond its comfort zone, stability becomes a skill, not a setting. The goal isn’t to eliminate jank entirely, but to control it so the run stays playable and fun.
Think of this section as damage mitigation. You’re already increasing the lobby size; now you’re reducing the risk that comes with it.
Designate a Strong Host (It Matters More Than You Think)
In modded large-group co-op, the host does most of the heavy lifting. Enemy AI updates, hit detection, and player state syncing all lean on host performance.
The host should have the strongest CPU in the group, a stable wired connection, and no background downloads. Laptop hosts on Wi-Fi are the fastest way to introduce rubber-banding and delayed damage ticks once you pass the default player limit.
If performance degrades mid-session, swapping hosts can sometimes fix issues faster than troubleshooting mods.
Keep the Mod Stack Lean and Purpose-Built
Lobby-size mods should be the foundation, not one piece of a massive mod pile. Every additional mod increases the chance of conflicts, especially UI tweaks, enemy overhauls, or progression changes.
Avoid stacking multiple mods that touch matchmaking, player spawning, or session limits. Even if they load correctly, overlapping hooks can cause silent errors that only appear after 30–40 minutes of play.
For large lobbies, less is more. A clean setup with one lobby-size mod and a few cosmetic or QoL additions is far more stable than a feature-heavy build.
Restart Sessions Proactively, Not Reactively
Desync doesn’t usually announce itself with a crash. It creeps in through missed hits, delayed revives, or enemies that feel like they have phantom I-frames.
If you notice these signs starting to stack, don’t push your luck. Finish the current room or encounter, then rehost the lobby before things spiral.
Veteran large-lobby groups treat restarts as part of the loop. A two-minute reset beats a 20-minute wipe caused by broken hitboxes and mismatched enemy states.
Adjust How You Play, Not Just How Many Players You Add
More players doesn’t automatically mean easier runs. Aggro becomes unpredictable, enemy pathing strains under crowding, and DPS spikes can cause strange behavior when too many damage events land at once.
Spread out roles instead of stacking everyone on the same target. Assign scouts, supports, and objective runners so the game isn’t trying to resolve eight players body-blocking the same enemy.
Positioning and spacing matter more in large lobbies than raw firepower. Chaos is fun, but controlled chaos keeps runs alive.
Accept the Performance Trade-Offs
REPO was balanced and optimized around a smaller player count. Larger lobbies will introduce longer load times, occasional frame dips, and UI quirks that never show up in vanilla play.
That doesn’t mean the setup is bad. It means expectations need to shift. You’re trading polish for scale, and that’s a valid choice if everyone in the lobby understands the deal.
If stability drops too far, scaling back by one or two players often restores smooth gameplay without killing the group dynamic.
Final Tip: Stability Is a Group Effort
The most successful large-group REPO sessions come from teams that communicate, restart early, and respect the game’s limits. Mods can raise the player cap, but discipline keeps the run alive.
If you treat large lobbies as an experiment instead of a guarantee, REPO becomes a chaotic, memorable co-op experience rather than a technical headache. Push the boundaries, adapt when things wobble, and don’t be afraid to reset and go again.