I'm seeing this message a a lot from mplayer on my nvidia based HTPC but not on my slower laptop with an onboard Intel gpu.
2.66Ghz C2D (nForce mobo)
1920x1080 display @ 50Hz
1200x800 display @ 60Hz
Example video (h.264 640x480 60fps)
mplayer -fs -vo vdpau -vc ffmpeg12vdpau,ffh264vdpau,ffvc1vdpau,ffwmv3vdpau, -ao pulse
System too slow message, audio out of sync yet cpu is < 10%
Switching to 1080p60 seems to help a little.
Dropping to 720p60, video plays fine
Switching to -vo xv, video stutters every few seconds
Switching to unscaled -vo x11, plays back fine
Switching -ao alsa/null, no difference
Any ideas? It was the same situation previously using the onboard nForce gpu before I upgraded to a 210.