If it's still lagging after a couple of hours and a reboot hasn't fixed it, you'll need to manually install the update from the OP to clear it up. If your phone boot-loops on you, try to get back into recovery. If you cannot do that, no matter what you do, contact Verizon about getting a new phone.
Hi furbearingmammal, I actually did use the one from the OP. But I was having the lag before with 2.1 as well toward the end. I would have though the update form this thread would have cleared it up.
I just wiped my phone again last night. I reappied the updated form this thread, cleared cache, did a factory reset, ceared cache again, and reapplied the update again. I know its kind od overkill and duplicating step, but I wanted to absolutely sure, non of whatever was causing the lag was going to remain. So far it seems better, but i've barely used to today and am still getting it setup back up the way I like it.