This game runs buttery smooth on my computer...for the first 10ish minutes. Then the frame rate drops to unplayable, and I'm somebody who's not picky about playing games at 30fps if necessary. I haven't been able to link it to performing a particular action or going to a specific locale - it seems to be independent of any of those, and happens on both Shleemy World and Flesh World. The performance drop is so bad that I can't quit out of the application through the pause menu like normal. I have to force quit it with taskmgr.
The really interesting bit of this bug is it's survived a complete computer upgrade. Played it on an Intel i5 with a GTX 970 at first. I got a new CPU, mobo, RAM, and GPU within the past few weeks, but sure enough, the bug still occurred.
Specs:
Windows 10 version 1909, build 18363.592
Geforce driver: 441.87
Ryzen 5 3600, MSI B450 Tomahawk flashed to most recent BIOS, 16GB RAM, EVGA RTX 2080 Super, playing off a Silicon Power nVME drive.
I've been googling around to find an answer without a lot of luck. Would love to know if anyone else has experienced similar issues and found any fix. Otherwise, the idea of playing this game in 10 minute segments sounds kinda tedious, haha :P