[Q] one more problem,thx

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1.Is that ok to use the mini-alpha version of xRecovery to install MiniCM RC1 which has been posted in this link -
http://forum.xda-developers.com/showthread.php?t=970842
2.Do I need to have a factory reset(also the dalvik cache and battery stats? or other things) before installing the rom?
My E15i (2.1 stock rom) rooted and installed busybox + xRecovery in the above link
Thanks.
Additional question:Who have laggy in Angry Birds when using the ROM?It is very strange that may become laggy after a few second and then become normal within 1 second but keeps repeating.

1. it's ok
2. from stock rom it's recomended to wipe data/factory reset.

Who have the same problem?Help!