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First identify what “laggy” means: low FPS or stuttering calls for graphics and performance checks; network delay is a separate problem. If Minecraft is running slowly on a computer with both integrated and dedicated graphics, check GPU selection first, then tune settings for the rendering module and Minecraft version you use.
Identify the kind of lag
Before changing settings, note what you experience: consistently low FPS, brief stutters, slow chunk loading, delayed mouse or keyboard input, or network delay. These symptoms can have different causes. Lunar Client’s FPS troubleshooting guide focuses on rendering performance; changing video settings is not an established fix for internet latency.
Make sure Lunar uses the right GPU
If your computer has integrated graphics and a dedicated graphics card, check that Lunar’s Java runtime is assigned to the dedicated GPU. Lunar Support identifies integrated-GPU selection as a common explanation for unexpectedly low FPS and provides Windows instructions for choosing “Zulu Platform x64 Architecture” in system graphics settings. Follow the current Lunar instructions for your Windows version and installed runtime.
Adjust video settings for your rendering module
Lunar’s available controls depend on the Minecraft version and profile. Use the settings for the module actually active in your game rather than copying options from a different menu. Lunar’s FPS guide covers OptiFine and Sodium separately.
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If your profile uses OptiFine
- Try Fast graphics, turn Smooth Lighting off, and reduce Render Distance.
- Enable VBOs if the option is available for your version and hardware.
- Check OptiFine’s Performance and Quality menus. The guide discusses options such as Smooth FPS, Fast Render, Fast Math, Chunk Updates, Dynamic Updates, and Render Regions, as well as antialiasing and anisotropic filtering. Availability and suitability vary by version and graphics hardware, so change options selectively and compare how the game behaves.
If your profile uses Sodium
- Try lowering Render Distance and Simulation Distance where those controls are available.
- Check fullscreen mode, VSync, and Maximum Framerate; then adjust transparency, particles, entity distance, and shadows if needed.
- Review Sodium’s built-in culling and performance options. On multiplayer servers, the server can cap render distance and controls simulation distance, so changing a client setting may not change what the server allows.
Lunar’s guide describes Sodium for newer Minecraft versions and OptiFine for many older ones, but compatibility changes over time. Confirm the active profile and current menus instead of assuming a setting exists in every version. Lowering visual settings can reduce visual quality; there is no guaranteed FPS gain for every computer.
Check Lunar’s Performance settings
In game, press Right Shift to open the Mods menu, then go to Mods > Settings > Performance. Where available, Lunar’s guide recommends leaving HUD Caching on and Use Particle Physics off. The menu also includes unfocused and main-menu FPS controls. Options differ by version and by whether the profile uses OptiFine or Fabric; a missing option does not by itself indicate a problem.
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Keep memory allocation reasonable
More allocated memory does not automatically mean better performance. Lunar’s memory allocation article advises not allocating more than 4 GB to Lunar Client and provides a table of suggested allocations based on the computer’s total RAM. Use its table for your system rather than increasing memory blindly. This is Lunar’s configuration guidance, not a benchmark or a prediction of how much FPS you will gain.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check overlays, background apps, and graphics drivers
- Temporarily disable Discord clipping or game overlays and see whether stuttering changes. Lunar lists these as possible sources of rendering impact, not confirmed causes on your computer.
- Update your graphics drivers if you are troubleshooting stutters, crashes, or uneven frame times. This is a troubleshooting step, not proof that an outdated driver is responsible.
Make one change at a time and compare the same in-game situation. That makes it easier to tell which adjustment helped and to restore a setting that made things worse.
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