Could be your device has an issue with Ren'py games then. Might be a graphics driver issue.
The only other solution I have is try locating your %appdata% folder / Renpy folder / deleting the Terrene folder/any other games you have issues with. This will wipe your save data but might help the game run smoother.
It's hard to say what's causing your issue, but if you've deleted the games folder from %appdata% and your device still has issues, then the problem might be a memory issue(Maybe Ram).
Try task manager and make sure nothing is taking up memory.
You could try playing renpy games on another another device
(Most renpy games usually have an android port, so you could play on android/phone too.)
