Legacy Dynamic FPS
by Polyfrost
Legacy Dynamic FPS lowers the frame rate of Minecraft 1.8.9 while the game window is not active, so an idle client uses less power and resources.
What it does
Legacy Dynamic FPS is a Minecraft 1.8.9 port for the Ornithe loader, based on the Dynamic FPS mod for Fabric. It is a fork of that work and is client-side only, so only the player's client needs it. It requires Ornithe Standard Libraries, and OneConfig is optional for a simpler configuration screen. The mod is open source under the MIT License, and its source code is public. Files are published for 1.8.9 only.
Key features
Frame rate when idle
The mod detects whether the game window is focused, hovered over or unfocused, and caps the frame rate to match.
Adjustable frame rates
Players can set the frame rate used while the window is active and while it is in the background.
Compatible settings file
The config file is backwards compatible with the original Dynamic FPS mod, so existing settings carry over.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 1
Questions
Does Legacy Dynamic FPS need OneConfig?
In the catalog
Legacy Dynamic FPS is one of 3,545 Optimization mods on ModsFinder. 955 mods support Minecraft 1.8.9.
More from Polyfrost
Similar mods
What the author says
Reduce resource usage while Minecraft is in the background, idle, or on battery. Dynamic FPS will detect whether the Minecraft window is currently active, being hovered over, unfocused, or invisible. For each of these states you're able to adjust the frame rate and volume.
Official listing
- Modrinth page
- modrinth.com/mod/legacydynamicfps
- Owner
- Polyfrost
- Published
- 2026-09-04
- Updated on Modrinth
- 2026-09-04
- Facts verified
- 2026-10-15