i found the culprit for my jumpy gameplay in everything..
the soundcard. I got it a while back when i first started using linux before i gave up, i went into a shop and asked for their cheapest soundcard.. its an X wave 512, ess allegro sound chip.. whatever that is.
I disabled the sound from booting up and when i played homeworld there was no sound, and it was running so smoothly, only no sound
it doesnt run bad with sound, just jumpy and some sounds are not played..
solution:
ordered a creative sound blaster Audigy (refurbished) from their website:
link