Strange, with Grim (640*480 windowed) :
In OpenGL / OpenGL mode, i dont see FPS but In OpenGL / Software seem ok

Hard to have stable FPS... between 150 - 30

My config : G5 2.7 with Radeon 9650 256VRAM, hard to compare, need somebody with X5000

https://www.morphos-storage.net/upload/test/Grim1_OPENGL_SOFTWARE.png
https://www.morphos-storage.net/upload/test/Grim1_OPENGL_SOFTWARE1.png
https://www.morphos-storage.net/upload/test/Grim1_OPENGL_SOFTWARE2.png


yes i confirm, i test transition with two driver and transition is bad lol (only in OpenGL/OpenGL mode) I complet your ticket on scummvm to confirm that.