To stabilize your performance, you should combine in-game graphical adjustments with external Windows and driver-level tweaks. 1. In-Game Graphics Optimization
These settings provide the highest performance gain with the least visual impact: FAR CRY 5 - How to BOOST FPS, FIX STUTTER AND LAG
For many players, Borderless Window mode actually provides better stability and higher FPS than Fullscreen in this specific title. 2. Fixing Stutter and Lag (External Tweaks) To stabilize your performance, you should combine in-game
Keep this at Low or Normal ; higher settings have a heavy impact when near rivers or lakes. To stabilize your performance