Mail Slows Down my Internet Speed

After the recent November 10.6.5 update, the Mail app brings my internet connection to a crawl. I used to have a solid 12Mbps connection and <25ms ping times but while Mail runs, is kills the speed to less than 2Mbps and over 200ms ping times.
I have Mail configured as IMAP to my GMail account. Everything worked fine up until I did the OS X update. I even deleted my account from Mail preferences and re-entered the account information...no change.
Any help?

I had this exact same problem. It suddenly started when I reset my router to the original settings. Every thing suddenly was slow, then I finally figured out it was Mac Mail, searched Google for an answer, found this thread, then went in to my router page, since no one could figure out the cause. ***BINGO***
I fixed it by going to the Firewall settings.
IP Flood Detection   [square box here] Enable
I un-checked the square box and slow speed be gone!!!!!! This was in the Ubee router at
http://192.168.100.1/RgContentFilter.asp
but for other routers, it might also have a Firewall setting like this some where. Hunt through your settings at
http://192.168.100.1/
It looks like my Linksys router thinks that there is an attack going on and slows down my connection.
is what gave me the idea to go hunting through the router, a uBee router. Thanks.

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