sis76x is slow - netcraft confirms it
well i knew something is wrong with this chipset (video and ide controller)
When playing movies , the stream is not real time and smooth as it should
and here is why :
"76x - if used with shared memory only - is not really usable in dual head configurations; even in single-head operation, some features are limited. This especially affects video overlay support (Xv): Although the SiS76x supports two video overlays, these are in most cases not usable: Heavy flicker in the video and the graphics may occure as a result of exceeding the available memory bandwidth."
Update: I added 512M of ram and now system is way faster, I will try some benchmarks soon