Hi Product Hunt — I am sharing LeanFPS, our MIT open-source Windows game optimizer. For people comparing Radiant Optimizer alternatives, LeanFPS offers a free core and an optional US$19 one-time Pro license. The complete source is available to inspect, modify and build: https://github.com/Jamailar/leanfps It is written in Rust with egui. The native executable is about 6.5 MB and can run directly; an optional installer is also available. No .NET, WebView or account is required. It detects supported games, applies reversible Windows tweaks, and measures average FPS and 1% lows using ETW. Undo restores saved previous values. Temporary session changes are restored when the session ends; persistent changes remain until Undo. Defender, the firewall, Windows Update and CPU security mitigations stay enabled. The free core includes five tweaks, game detection and FPS tracking. Pro unlocks additional tweaks and profiles. Results depend on the PC and game, so compare your own before-and-after measurements. The gallery uses our public demo UI with example data, not a measured performance claim. What would make an open-source optimizer more useful for your gaming setup?

LeanFPS

Open-source Radiant Optimizer alternative for Windows

Open-source Radiant Optimizer alternative for Windows