have anyone tried playing MP4, which length about 23 minutes with sizes around 230 MB on a Pentium 4 2A GHz with 512MB ram ? I played it with WMP10, the CPU usage has reached up from 65 to 100%, it make some scene is lagging of sound by 2-3 secs, this can be determined during the OP of the anime.

When I run the old mplayer2(not media player classic), problem seems resolved a bit, but the CPU usage still around 45-99

does MP4 with class 10 AVC really need some high end processors?

I am using CoreAVC included in kLite, I need to turn off all firefoxes in order to view smoothly