Hey dude, SR2 PC strikes again with its random quirks. Been there a hundred times with GOTR + clothing mods like M2M.
Since it was running smooth then suddenly started stuttering after a break with zero changes on your end, 99% chance it's either:
1. Stealth Windows update or GPU driver auto-update (NVIDIA GeForce Experience can mess with SR2). Roll back your drivers to whatever you had before via Device Manager > Display Adapters > Properties > Driver tab, or use DDU for a clean uninstall + install older ones
2. GOTR patch got corrupted somehow. Fire up the GotR builder, clear your custom patch folder, rebuild fresh (tick all the usual suspects but untick any suspect streams if you're experimenting), then delete loose.txt in your SR2 root and let it regen on launch
3. Quick fixes that solve 80% of stutters:
- Right-click SR2_pc.exe > Properties > Compatibility > Disable fullscreen optimizations + Run as admin.
- Add "-windowed -noborder" to launch options in Steam (forces borderless, reduces vsync lag).
- Cap FPS to 60 via RivaTuner or in-game if possible.
- If you're on dgVoodoo2 (you should be), tweak the config for your GPU (search "dgVoodoo SR2 stutter" on Reddit for presets).
Launch clean first (disable all mods except core GotR), test a mission, then layer M2M back on. If it persists, drop your specs + dxdiag here and we'll debug
Fixed mine last week the same way hang in there, she'll run great again!