Problem playing videos/movies with Galaxy Gio

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http://androidforums.com – Hello. At first I used some version of Mx player and every video/movie played perfect to me. After updating mx player everything went to hell. Only few smaller videos(american dad 170mb.mp4) are barely watchable, but other mp4 wich is 445mb, lags a lot and sound always skips ahead and stops to wait video. I have not tried with other formats because all my media is mp4. I have tried every well known player there is and all the latest mx player versions but nothing works. Any suggestions how can i run my mp4s smoothly? Searched google and couldn't find any solutions. (General)