The two Rainbow Six Siege settings NOVA can switch for lower input lag, exactly what each writes, and how to measure them.
No FPS promise here: what Siege gains depends on how your PC is set up today. NOVA shows what's holding it back, then measures before and after.
01What NOVA changes for Siege
These are in Tweaks, off until you switch them on. Each edits Siege's own settings file, only while the game is closed: the same change as its video menu, made for you. Your current value is backed up first; switch it off and it goes back.
in-game V-Sync off
B · Measured by one lab or tester
Turns off V-Sync in the game's own settings, which holds each frame until the next refresh and adds input lag. With G-SYNC, use NVIDIA's G-SYNC setup instead of in-game V-Sync. Close the game first.
Exactly what it changesIn GameSettings.ini in each account folder under Documents\My Games\Rainbow Six - Siege (Documents wherever Windows keeps it, OneDrive included), changes every existing VSync= line to VSync=0 (no line is added if it's missing). Nothing is changed while RainbowSix.exe, RainbowSix_BE.exe or RainbowSix_DX11.exe is running.
one buffered frame
C · Documented by the maker
Lets the CPU prepare only one frame ahead of the graphics card (MaxGPUBufferedFrame = 1), which cuts input lag when the GPU is the limit. Turn on NVIDIA Reflex in the game too if you have it. Close the game first.
Exactly what it changesIn GameSettings.ini in each account folder under Documents\My Games\Rainbow Six - Siege (Documents wherever Windows keeps it, OneDrive included), changes every existing MaxGPUBufferedFrame= line to MaxGPUBufferedFrame=1 (no line is added if it's missing). Nothing is changed while RainbowSix.exe, RainbowSix_BE.exe or RainbowSix_DX11.exe is running.
Plus everything that isn't game-specific: Windows, power, network and input settings, and Game Boost, which applies per-game settings each time Siege runs and puts the PC back when you close it. Every tweak →
NOVA