Mail Slows Down my Internet Speed

Kesney wrote:
I am having the same exactly issue. If I use http://www.speakeasy.net/speedtest/ to measure my internet speed while the Mail program is off I get consistently download speeds between 9 to 10 MBPS, if I launch the Mail program which connects to my GMail account, I get my speed to drop to 0.5 to 1 MBPS consistently.
It looks like my Linksys router thinks that there is an attack going on and slows down my connection. If I place my iMac in the DMZ, my download speed averages 3MBPS. *Now there are 3 people reporting this, how many will be necessary for Apple to respond?* I hope the costumer services on this forums is as good as what we get at the Apple Store, which is unbelievable good.

Any help will be very appreciated.

Kesney

I am having the exact same problem. Narrowed it down to mail account. Speeds drop off when I open mail and go right back up when I close it. And I have been having to force close mail. I the apple mail software and have a .me account. Any ideas on how to fix. Could it be a virus? How can I detect?

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.

I unchecked IP Flood Detection in my router and everything is back to normal!!!!!

THANK YOU! this has been bugging me for months!!

I've called Apple 3 times, my IS... I have a Quad Core i7 with Maxed RAM and I was using internet on my Laptop!

I have the same slowing down problem recently and I am trying to fix it the way you did. However, my verizon fios router's Firewall settings do not have a IP Flood Detection check box. Any suggestions? Thanks.

I see this same exact issue, have been banging my head against the wall for a couple months and beating on ATT for it. As soon as I open Outlook, my latency times go up from 60ms to 700-800ms on ALL machines off the router. If I close Outlook on the Mac, it immediately drops back down to normal. Can't wait to get home today and try this on my DSL modem, this solution makes sense as I don't see the issue when connecting through Comcast.

Unfortunately I don't have this option anywhere on my Actiontec modem, or on my Belkin router....any other ideas?