are you on pr1.2? -Yes are your movies on a sd card? -No, they're in device's own memory how many space you have in rootfs? -82.4MB free which tasks are running? -Just the player, I end everything else for the time of the movie. I mean visible software. I don't know about any tasks than run within the system. did you tried top in xterm to see whats wrong? -I tried now. The default player goes automatically into paused state when I change back to xterm. I don't see anything weird in top. It could be that I don't interpret it right. I'm a linux noob. =/ did you a correct overclock? -I installed the "Enhanced Linux kernel for power users" and used the QCPUFreq -app to OC the cpu. The cpu freq resets to 600MHz everytime the N900 is being restarted and needs to be raised again from QCPUFreq, this doesn't bother me though. I've been using 900MHz and 850MHz. sry for the many question but it can have 100 reasons. normally it should run good in default mplayer(for me it does even with 2gb video files) regards -I understand. Thanks for your help, mate! =)