Download SRHook 10

From TOS over at the Eidos forums
http://forums.eidosgames.com/showthread.php?t=114106

Increases framerate from 30FPS to 60FPS, also allows for widescreen

"Just extract the files to the game folder. You don't need to do anything other than select a widescreen resolution in the configuration dialog -- it will work automatically once this is installed.
The framerate cap can be changed in the .ini file (it's set to 60 FPS by default). I wouldn't recommend setting it much higher because the game will start behaving oddly. 60 FPS works mostly normally, though I've noticed that Raziel can jump slightly higher than usual. You can also enable debug keys in the .ini to speed up game time (useful for cutscenes you've seen a million times), possess monsters or show the debug menu."