Try forcing your 8320 as WiFi only, by default all your traffic proxies through blackberry.net servers -- I notice a remarked increase in speed (even to just install stuff from my own, private OTA server on the public 'net) when I force traffic to not proxy.

reference linky:
http://www.blackberryforums.com/wifi...tml#post687201

(your profile says vzw, you talk about the 8320 then the 8820 so I don't know which carrier you're dealing with here )