Is nice for some simple situations. Can be a good fixer.
The point is, if you work on some serious mapping, you can´t handle dozens of non square masks.
Render and correcting by slicing is still your best shoot.
Same problem here. I have a laptop just with arena in it. One day I play it a bit, all runs smooth and gives me over 60fps. Then, another day I just turn on, open resolume and the fps goes down to 20 fps. No changes on resolume config, power settings, display settings, no hd changes... A mistery. I ...