Performance issues in full screen

[Chickan117]

Hi everyone. I'm running my game in 640x480 resolution and, when windowed, it runs at a nice 60 ish FPS. As soon as I go into full screen mode however it drops down to 18 FPS which, when scrolling the screen, looks terrible.

Does anyone have any hints / advice regarding this?

I'm running RPGM VX Ace
I've tried restoring "normal" resolution but I still have the same issue
This happens in a new/blank game as well as my proper title.

I'm considering introducing the "windowed" look to the game as a means to try and control this but that would be a real shame IMO