Stable FPS

Minecraft mod to fix long-standing FPS stability issues.

1. Implement proper frame pacing when FPS target is limited (due to user setting or being inside a menu):

• Minecraft 1.21.11 and below: Allow FPS to actually reach the target instead of randomly being 5-20 FPS lower.
• Minecraft 26.1 and above: Fix dropping by 1 FPS due to using out-of-date information.

1. Get inputs on a separate thread to fix FPS dropping by 2-3x when moving the mouse (especially on high polling rate mice on Windows) due to glfwPollInputs().

Comparison:

• Vanilla: https://www.youtube.com/watch?v=OW-tKVvHjY4
• Stable FPS: https://www.youtube.com/watch?v=lk8H2A76Nss

NOTE: You may experience graphical glitches when starting the game or resizing the window – this is intentional, as it would require a ton of work to fix and I want to keep the changes to a minimum to be compatible with other mods.

Compatible with Sodium. \
For a version compatible with Ixeris, see Lite FPS.

Recommended settings:

• Fullscreen: ON (due to Minecraft using Hardware: Legacy Flip on Windows)
• VSync: ON (to not waste time rendering frames that won’t be shown)
• In Vanilla: Max Framerate: Unlimited (due to Vanilla fps limiter being broken)
• With Stable FPS: Max Framerate: any

NOTE: Some versions of Minecraft have a slow renderer, so you may need to limit your fps further on those.