to el_pusher: i switched back to 22050 and checked cpu load-there is no difference to 44100hz.well i´m running it on a fast machine but it would be interesting if this sampling rate can fix this problem for others too.

i had the same problems with any game i run,and i found out that the stutter was periodically-10 seconds sound then 1 second stutter,repeat.after i tried the changes suggested in this thread i simply used 44100 hz sampling rate instead of 22050- and the stutter was gone.