How to figure out that mp3player is delayed when seek bar is working with ??

Question

While playing mp3 by mediaplyer and showing the progress with seek bar,

the problem is that mp3playing sound is delayed when mediaplyer and seekbar working at the same time.

I used thread, handler, timer for solving that problem on seekbar.setProgress(mediaplayer.getCurrentPosition()).

what do I do?? sdk can take more playbuffer for mp3player..??

or I should focus on optimizing code than before..??