About videos, mp4 formats with reasonables resolutions and framerates are showed fine, but it takes a little time in loading it.
Well, on my legend, even videos with lower resolutions than the screen are laggy. They skip a lot of frames. They don't take time to load, they start immediatly. All my mp4 videos were played perfectly on other ROMs. This isn't a big problem, I can live with it. Just reporting it.
Ah, I removed the Music app in the system/app folder replacing it with the new CyanogenMod music player. It worked for me, and the player is better.
I also tried moving Apex Launcher to system/app ( to insert widgets from the drawer. It isn't allowed when Apex isn't a System App ), and then I rebooted. Apex Launcher never started again.
I also benchmarked ( Quadrant Standard ) my Legend with ogo2's NewSense ( overclocked to 768 MHZ ) and with this ( overclocked to 787 MHZ ).
ogo2's NewSense :
Total : 499
CPU : 191
Mem : 875
I/O : 551
2D : 317
3D : 559
zeubea's CyanogenMod9 Alpha :
Total : 556
CPU : 631
Mem : 849
I/O : 483
2D : 235
3D : 584