I don't know how to troubleshoot that problem if I'm not able to replicate it on my end. Why don't you try redownloading the game and extracting it in a different folder. Rename your old save folder at 'C:\Users\USERNAME\AppData\LocalLow\LAGS\RingManSpiritHunt' to something else temporarily and see if it works with fresh save.
Viewing post in FPS Drop
I managed to fix the problem. After this update, the SaveData is now organized in a column format, while in previous updates it was in rows—or rather, plain text. I had to format my PC and backed up my old SaveData, but I didn’t launch the game again until this latest update. I believe that’s what caused the FPS drop. I ended up downloading a SaveData file from another player on a different site, and the issue disappeared. I really appreciate your attention in trying to help me solve the problem. Also, I want to congratulate you on this amazing game!