It has been reported that this can be fixed a few ways, switching to windowed mode, changing to 30 fps, turning off vsync, or some magic combination of those options. There have been numerous complaints in the Steam forums about this issue since the second that the game was live. I'm surprised there hasn't been a patch for it yet honestly.
Switching to 60 fps solved it to me... thanks!
Omg thanks! I was wondering where it was coming from hahaha! I thought it was when npcs or treasures were abound. Gosh, I'll play with this option off.
I got "Set LP" to work. You go into character status screen (Ex: Vaan), enable trainer option, and exit out of status screen and menu entirely. When you go back into menu, it should be set