Sorry that my pc is garbage! >.<
This only seems to happen with newer renpy, as for example, the new renpy 8. I have tried switching to my integrated gpu, and it has no effect. the same with the 32 bit version.
Also, its not that Ikimashou is resource heavy, its that my pc components became out of the norm long long ago.
Hoping that Im atleast helping you avoid some future problems instead of making a lot of new ones. ;-;