Windows 11 handles "borderless windowed" mode differently than previous versions, which can cause stuttering or mouse lag.
The most effective fix, therefore, begins not within the game’s .ini files, but inside Windows Security. Disabling Core Isolation Memory Integrity—while a decision that should be weighed against one’s security needs—instantly restores MGSV ’s frametime stability on most Windows 11 systems. For those unwilling to lower their security posture, a surgical alternative exists: launching the game via the sde-win (Software Development Emulator) tool with the -ksp (Kernel Security Patch) flag, which forces the game to run in a legacy compatibility ring without disabling system-wide protections. Metal Gear Solid V The Phantom Pain Fix For Windows 11
Corrupted shader caches or config files from Windows 10 cause crashes. For those unwilling to lower their security posture,
For many Windows 11 users, a specific DLL conflict prevents the game from launching entirely. Metal Gear Solid V The Phantom Pain Fix For Windows 11