Someone at the My-Symbian forum discovered this trick to speed up your Sony Ericsson 990i (UIQ 3) menu speed which is very slow due to transition animations by playing a video in the background.

1. Reboot your phone
2. Flip down to full screen mode
3. tap on the “up arrow” tab on bottom left hand corner of LCD screen. Then tap on any of its menus. Take note of the “speed” of opening these menus.
4. Tap on the large “Main Menu” icon (2nd icon on the bottom left of LCD screen). Take note of the animated transition effects. Also take note of the “speed” of this effect.
5. Now, go to Media Player and start the Video player. Playback a video file, perhaps the demo if you have not encoded any videos.
6. Now go back to the main screen and test out step 2 - 4 again… SUPER FAST MENU RESPONSE

The trick is, playback a video (NEED NOT complete the whole video, just start playing something) and LEAVE THE VIDEO PLAYER ON and do not use Task Manager to kill it.

Now, this does proves that the P990i’s menu speed can be this fast! The transitional effects greatly affects the phones overall speed and performance. The video player somehow helps to restore the menu speed to its MAX.