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Not all Droids can run at the same processor frequencies. Try dropping down a speed or two and see if it will boot there.
What application are you using for your music?
Recently rooted and started using this custom rom myself. From my about a week of experience, this is what I can tell you.
1.) It works great. I...
See ongoing:android_myths [CVPCS Android Wiki] for your question on memory. May even help with the "lagginess" you are having.