Rainbow Six Siege is actually well-optimized by Ubisoft standards, but the game has a unique render scaling system that can be leveraged for massive FPS gains without significant visual quality loss.
Render Scaling — The Biggest Gain
In Display Settings, find Resolution Scale. For competitive play, 80–90% render scale at 1080p gives a major FPS boost with minimal visual degradation — most players genuinely cannot tell the difference in gameplay.
In-Game Settings for Maximum FPS
- Display Mode: Fullscreen
- VSync: Off
- Frame Rate Limit: None
- Shadow Quality: Low
- Reflection Quality: Low
- Ambient Occlusion: Off
- Anti-Aliasing: T-AA or Off
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See Services →Ubisoft Connect Overlay
Disable it in Ubisoft Connect Settings → General → Enable in-game overlay — uncheck this. Also disable crash reporter and analytics features in the same menu.
CPU Optimization for Siege
Siege is heavily CPU-dependent due to destruction physics and audio propagation. Key optimizations: disable CPU C-States in BIOS, enable XMP for your RAM to maximize memory bandwidth, and set Windows power plan to High Performance.