Smart Movie sluggish @ 128bit using X700

[Lestat]

Hi guys! I'm currently using X700 for a few months now. *sigh* Not so happy with the phone. Quite disappointed with the multimedia performance compared to Nokia 6670 or 7610. SInce I got the phone, I tried to install Smart Movie in it. This is my feedback:-
1.Sluggish play when using avi file encoded @ 128bit.
2. Able to play well when disable the sound encoding even @ very high bitrate.
3. Best sampling bitrate with sound is only @ 64bit without sluggish play.
I have converted the avi files @ 128bit with sound & and tried on both Nokia 6670 & 7610. Both phones played amazingly well.

I wonder is it due to the processor speed or graphical speed issue.
I installed a program called: SPMark04. It is a benchmarking program for symbian phone.
I did the benchmarking with Nokia 6670 & 7610.
The result:-
Every parameters tested of the X700, from the Processor Speed to the fps performance loses out to Nokia 6670 & 7610. The overall 3D test performance is lower compared to Nokia 6670 & 7610.

I wondered is it due to some hardware issue that Nokia 6670 & 7610 has which X700 do not have. I have a gut feeling that it is something related to MP3 capability. (from the experiment i did with enabling/disabling sound during avi file conversion)
Nokia 6670 & 7610 are built with the capability to play MP3 files. However, the X700 required 3rd party program in order to play it. That could means some firmware is missing in X700 for the MP3 capability.

If you guys out that using X700 and is playing the avi files well @128bit sampling with no problem at all. Any tricks/tips you guys can advise me? Thanks! *Sigh*