I've spoken with the Pioneer Canada service people. They've been anything but helpful, but I did find out that there has been no firmware upgrade for the 588A player yet.
My 588A is pretty slow to load as well, but I haven't noticed any noise problems at all. I also haven't been having any problems with DVDs either. Maybe you just got a bad unit. Call up the store, tell them the problem, and ask them to replace your player with another. If that still doesn't work, give Pioneer a call. Hopefully, they'd be able to help.
cheers,
supervij
EDIT: While Pioneer hasn't released any firmware upgrades, I believe you can find some boards on which users have created their own firmware upgrades and shared them with anyone else on those same boards. Do a Google for it, and you'll probably come up with something.