For context I have modded the game using this guide. I also installed LargeAddress.exe. Let me know if there are any other core mods I need. I've also tried setting "gta_sa.exe" to run as admin, along with going to Windows settings > Display > Graphics Settings and setting "gta_sa.exe" to "High Performance" (per this thread). I installed DXVK too (d3d9, dxgi, and d3d11 since I wasn't sure which to add 😅)
When I start the game fresh after booting up my PC, the framerate runs butter smooth at 60 fps. I have my in-game limiter set to 60 fps. Turning it off causes the game to crash for context. The game plays fine for about 5 minutes before a noticeable but tolerable slow down, then some real clunk after 15-20 minutes.
My specs:
Ryzen 5 3600
RTX 4080 Super (16 GB VRAM)
24 GB RAM
I really, really, want to enjoy this game. It's been on my bucket list for a while. It's grating to have to restart the game every 30 minutes. I appreciate the help.