A "slow" problem, plz help

[cold_fusion_xx]

I have installed a Magic 3 in a Version5 PS2, few backups of PS1 games were tested and the results were pretty good.

But when i tried my PS2 original games (not back up) a problem occured: game movies (the opening movie as an example) were very skippy. I was able to skip the movies, and found that in game loading time was also increased....

Is there something i did wrong?