There might be some memory management issues. Whenever I feel the phone is getting a little slow, I just use ATK and kill some of my tasks (though I feel I'm doing this more often on this ROM than on Pete's BB).
Also, I find it strange that, for me at least, the contacts app takes really long to load up.
As for returning home, I used to have the issue where it would take like 5 seconds for all the icons to load back up and for the device to become responsive. I thought that lowering my screens to 5 helped, and it did a bit, but I once again got the issue.
This time, I've used 'Spare Parts' to keep the launcher in memory (very last option at the bottom). I used ATK to keep track of memory while playing around with it, and it seems to do a better job of managing memory with this option checked. Surprisingly, I have more memory free with it checked than unchecked, and now my returns to home are instant.
Strange indeed...
And radikal, did you update.zip over an existing ROM or do a clean install? If you did a clean install, then it should not be any different than installing it through Clockwork recovery.