The cause of DOOM 3 jerkiness

[Chrome Ray]

If you have played both the original DOOM 3 and the BFG Edition, you would have noticed, that the former has some jerks and stuttering even whe playing on full 60 fps. If you don't understand what I'm talking about, try to strafe past the wall in game, you'll notice that ever once in a second one or two frames will be skipped, causing the "jerkiness" of the movement.

On the internet I've seen recommendations to set com_fixedTic to 1, but while it fixes the stuttering in gameplay, it also causes the audio in cutscenes to go out of sync.

After lurking a bit in DOOM 3 console commands I've finally found the solution. Now read carefully. The reason these stutters appear is because the whole physics engine works at exactly 62.5 FPS, and when you play at 60 fps the movement is interpolated unevenly to your framerate. Why it happens in DOOM3 but doesn't really happen in any Quake 3 Engine games is beyond my understanding, but once you set your monitor to work at 63 Hz (which is slightly higher that 62.5 FPS) you'll quickly notice two benefits: the game will no longer have any stutters and vsync will no longer cause any lag, making it the ideal DOOM 3 experience. Enjoy:)

WARNING!: Although most modern monitors are okay with Hz-overclocking it can be really harmful to a lot of older models, so first make sure, that your model is compatible with OC. If it's not, stick with "com_fixedTic 1" or try not noticing it;)