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RimWorld performance problems can mean slow simulation, low visual frame rate, intermittent stutter, or long startup and save-loading times—and those symptoms do not have the same cause or fix. Start by identifying which one you have, then check your game version and mod setup before changing anything. RimWorld 1.6 already included several late-game optimizations; Ludeon Studios announced further improvements for 1.7, but its October 2026 announcement placed that version on Steam’s unstable beta branch, with 1.6 still on the main branch at that time. Check Steam’s current branch status before acting, and treat the studio’s performance figures as results from its own tests, not a promise for your PC.
What does “lag” mean in RimWorld?
First work out whether the problem is simulation speed, rendered frame rate, periodic stutter, or loading. Players often use “lag” for all four, but a change that helps one may do nothing for another. A post titled “What causes a lot of lag in Rimworld?” illustrates that common shorthand; the useful next step is to describe the symptom more precisely.
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| What you notice | Which kind of problem it suggests | What to record first |
|---|---|---|
| The game runs at a low speed even when the screen looks smooth | Simulation slowdown: the game is advancing its world more slowly than expected | Whether it occurs at a particular point in the same colony, and whether it began after an update or mod change |
| Movement, scrolling, or animation looks choppy, but the colony’s simulation pace seems normal | Rendered frame-rate trouble | Whether it is constant or limited to a particular view or situation |
| The game pauses or hitches briefly, then continues | Intermittent stutter | How often it happens and whether it coincides with an action, update, or other change you can reproduce |
| The game takes a long time to open a save or start | Startup or loading delay | Whether the delay is at launch, while loading a particular save, or during world or map generation |
This distinction matters because the available official performance notes focus on particular areas—such as pathfinding, lighting, and loading—not on one universal “lag” setting. Keep the categories separate while troubleshooting. If the problem changes from one symptom to another, record that too rather than treating all slowdowns as one issue.
How should I check the game version and branch?
Check the version and whether you are playing the main branch or an unstable beta before changing mods or saves. Performance improvements and mod compatibility depend on the version, and the branch situation can change after an announcement.
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Ludeon Studios said in its October 12, 2026 announcement that RimWorld 1.7 moved the game from Unity to the studio’s Waylith Engine. At the time of that announcement, 1.7 was available on Steam’s unstable beta branch and the main branch remained on 1.6. That is a dated snapshot, not a guarantee of today’s branch status: check the current Steam listing before following version-specific advice or switching branches.
Write down the version and branch you actually use. If you are considering an unstable branch, make a backup of important saves first and check that your active mods support the version. A branch change is not a controlled performance comparison if it also changes the game version, mod compatibility, or the set of active mods. If you do switch, preserve the original setup so you can return to it rather than relying on memory.
What should I record before changing anything?
Make a short baseline record so you can tell whether a change helped. Include the game version and branch, whether the save is vanilla or modded, the active mod list and load order, the symptom, and when it began. Note whether the slowdown appeared after a game update, a mod update, or a load-order change; if you do not know, say so rather than guessing.
Choose a repeatable situation where practical: the same save, similar in-game situation, and similar view state. Then compare after changing one variable. This is not a guarantee of perfectly controlled conditions—colony activity and other workload differences can affect the result—but it is more informative than changing several things and judging from a different moment or save.
- Describe the symptom. Separate slow simulation from choppy visuals, pauses, or loading delays.
- Record the setup. Capture the game version, branch, whether the save is vanilla or modded, and the mod order if applicable.
- Mark the timeline. Note when the issue appeared and the last known game, mod, or load-order change.
- Establish a baseline. Revisit the same save and comparable situation, and record what happens without changing the setup.
- Change one thing. For example, investigate one suspect update or one compatibility issue at a time; do not simultaneously switch branches, remove several mods, and alter the save.
- Compare and keep notes. Record whether the original symptom improved, stayed the same, or became worse. If the comparison is not like-for-like, treat the result as uncertain.
For a modded game, this method avoids a common false conclusion: “It is modded, so a mod must be the cause.” A modded setup makes compatibility and load order relevant, but it does not by itself identify the cause. Preserve the list and order before troubleshooting so you can reproduce or undo a change.
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What performance work is already in RimWorld 1.6?
RimWorld 1.6 includes several optimizations Ludeon specifically described as targeting late-game performance. Its release notes say pathfinding became fully multithreaded and batched, and lighting was also multithreaded. The studio additionally cited optimizations to caravan foraging, egg-laying pawns, alerts, hauling, and animal-pen calculations, alongside fixes for several major memory leaks. See Ludeon’s 1.6 performance improvements and release notes.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsThose changes describe work in the game; they do not diagnose an individual colony. Ludeon cautions that results vary with PC-specific bottlenecks and mods. If you are already on 1.6, those release notes are context for why performance may differ from an older version, not proof that every slow colony should be fixed by updating or that a particular late-game system is responsible.
The studio also published a startup comparison on its development machines: version 1.5 with all expansions took 18.57 seconds to launch, versus 4.66 seconds for 1.6. Ludeon warned that startup results can vary with a player’s PC and mods. The figures are specific to the studio’s machines and that comparison; they are not a target load time for every player or a guarantee that a particular setup will improve by the same amount.
What did Ludeon report about RimWorld 1.7?
Ludeon reported additional performance improvements in its 2026 announcement, but the published figures are the studio’s own results and should not be read as expected gains for every player. At announcement time, 1.7 was on the unstable beta branch, so check the branch status and your mod compatibility rather than assuming it is the right troubleshooting step.
For a late-game comparison of 1.7 with 1.6, Ludeon said it saw 2.2× better performance in its own test. It also reported that a 1,500-mod pack loaded in six minutes rather than 14 minutes. Both figures are attributed to Ludeon Studios’ 2026 tests, not independent benchmarks or user-wide guarantees; the studio says individual results depend on the PC and mods. The 1,500-mod result is especially specific to the tested pack and setup, so it should not be used to predict how quickly a smaller or different mod list will load.
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The relevant source is Ludeon Studios’ announcement of the Waylith Engine and Update 1.7. Use it to understand what the studio reported, then check the current branch and version before using 1.7-specific instructions. If testing a beta is not necessary for your situation, do not treat the existence of a performance claim as a reason to put an important save or mod setup at risk.
How do I troubleshoot a modded colony?
Start with compatibility and change history, then isolate changes gradually. Do not remove a large group of mods from an important save as a first step: that can change the setup so much that you cannot tell what mattered, and it may complicate returning to your original state.
- Save the current configuration. Record the exact game version, branch, active mod list, and load order. Keep a backup of the save before attempting a change that alters the branch or mod set.
- Check what changed near the start of the problem. Review whether the game updated, a mod updated, or the load order changed. A timing link is a lead to investigate, not proof of cause.
- Check version support. Before trying a performance mod or changing the game version, verify that it supports your current game version and mod setup.
- Make a single controlled change. Change one relevant variable and revisit a comparable situation in the same save where practical. Avoid changing multiple mods and the game branch at once.
- Assess the same symptom. If simulation speed was the issue, do not count smoother visuals alone as a fix. Likewise, a shorter loading delay does not establish that in-game stutter is resolved.
- Undo a change that causes a new problem. Keep the original setup information so you can restore it; do not overwrite your only useful save or configuration during troubleshooting.
The FreePerformance project documentation describes a running-game compatibility report. It includes the game and mod versions, the status of each optimization, and the active mod load order. That can help inspect a particular setup, but it is a project-specific report and its published measurements describe the project’s own tests. A reported optimization status is not a guarantee that the same result will occur with every colony, PC, or mod combination.
If the slowdown began after adding or updating a performance mod, verify that the mod supports the game version and other mods in the active setup before drawing conclusions. If the available report or documentation does not cover your exact combination, treat the result as unknown. Avoid turning a tool’s compatibility indication into a broad claim that one mod is responsible for every performance issue.
Should I change versions or install a performance mod?
Only do so when the version or mod is compatible with the setup you want to keep, and when you can compare or restore your original state. A newer version may contain performance work, but branch changes can also change mod compatibility and the conditions of a comparison.
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For an unchanged vanilla or modded save, compare results after an update cautiously. The save, workload, view state, mods, and PC all affect observed performance, so a different moment in a colony is not a clean before-and-after test. Record what version and branch you used for each comparison. If you choose to try a beta or performance mod, back up the save first and check the current documentation for version support rather than relying on an older compatibility claim.
Do not treat a performance mod as a universal fix. The available data supports checking the current game version and mod setup, but it does not establish that one mod, configuration, or branch resolves every category of slowdown. If a change improves loading but not simulation speed, report it as a loading improvement—not as a general performance fix.
When should I consider a hardware problem?
Consider hardware only after identifying a measured system bottleneck; the available sources do not show that every slow RimWorld colony needs a faster processor, more memory, or better cooling. The game’s performance can depend on the PC and mods, but that fact alone does not identify which component, if any, is limiting a particular player.
Before buying or changing hardware, separate the symptom, record the setup, and compare a repeatable situation. If you do not have evidence of a relevant bottleneck, a hardware purchase is a guess rather than a supported fix. The sources here provide no universal CPU, RAM, cooling, colony-size, or map-size threshold, and no specific upgrade recommendation applies to every reader. Do not use Ludeon’s studio results as a way to infer the performance of your own PC.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How can I tell whether a fix worked?
A useful result is a change in the specific symptom you recorded under reasonably comparable conditions. Keep the old configuration and notes long enough to distinguish a genuine improvement from a different workload, save, view, version, or mod set.
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- For simulation slowdown: compare the same save and a similar colony situation; smoother animation alone does not answer whether simulation speed changed.
- For low frame rate: assess visual smoothness separately from how quickly the simulation advances.
- For stutter: note whether pauses recur and whether the change affected their frequency or severity; do not infer a cause from timing alone.
- For startup or loading: compare the same kind of launch or save-load operation, and account for the version and mod list.
Do not combine unrelated outcomes into a single verdict such as “the game is fixed.” A change can help one stage and leave another unchanged. If conditions changed between comparisons, describe the result as inconclusive and establish a better baseline before making another decision.
What should I do first?
Identify which kind of slowdown you have, note your version and branch, and record the mod setup before making changes. Then use one reversible change at a time and compare the same save and situation where practical. RimWorld 1.6 already includes documented performance work, while Ludeon’s 1.7 claims are developer-reported results from 2026 and branch availability can change. There is no evidence here for one universal mod, version switch, or hardware purchase that fixes every slow colony.
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Frequently Asked Questions
Does a large colony always make RimWorld run slowly?
The available official notes describe late-game optimizations, but they do not establish a colony-size threshold at which slowdown should begin. A large colony may be a useful repeatable workload for your own comparison, not proof of a universal cause.
Can I use the 1.7 performance numbers to predict my PC’s improvement?
No. The 2.2× late-game result and the 1,500-mod loading comparison were reported by Ludeon for its own tests. The studio says individual results vary with the PC and mods.
Is reinstalling RimWorld a proven fix for a slow colony?
The cited sources do not identify reinstalling as a general performance solution. Before considering disruptive changes, preserve the save and setup details and determine whether the issue is simulation, rendering, stutter, or loading.
Why does one RimWorld save load more slowly than another?
Loading results can depend on the version, mod list, save, and PC, so a difference between saves alone does not identify its cause. Record whether the delay occurs at launch or while loading a particular save, then compare similar operations.
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