It's probably slow because of all the bloatware Verizon puts on it. It makes a lot of unnecessary social media crap, amazon, blockbuster, and other things run in the background all the time. He could root the phone and freeze the apps, or get rid of them completely. I suggest you point him to droidforums.net or androidforums.com and tell him to start reading up on rooting and other mods he can do his phone.
If he want's to go back to Froyo (2.2) he just needs to look up "Droid 2 SBF" on youtube and he can see a walkthrough of how to do it, though all the VZ crap is still going to slow it down.