Sending Attachments slow (kind of...)

When using Mail, I've noticed that sending mail with attachments runs very slow. (Sending a regular text email works fine). It quickly drops down to a send speed of 30kb/sec or less. At least that's what it says. Sending a 1mb attachment takes almost 2 minutes.
One strange thing I've noticed is that the mail actually gets to it's destination BEFORE I hear the "swoosh." For example, if I send a 1mb email to my second email address, it still shows as "sending" on Mail, but I receive the email at my second address. Mail still shows as "sending" (at around 30kb/sec) for another 30 seconds or so before I hear the "swoosh."
Can anyone explain this to me?
I've used iAntiVirus and done a full scan. I thought maybe I had a virus that was using mail to send stuff out, but I don't think that's what's going on.
Any help would be appreciated.
Thanks.

There are no Mac viruses in the wild. The issue with anti virus software on a Mac is that it tends to slow down your system and some cases literally corrupt system software. And it can be a major headache to remove from the hard drive.
If you back up your important data on a timely bases, if you don't visit sites that are known for malware, anti virus software on a Mac is pretty much useless.
This is just one example of Norton a/v... http://discussions.apple.com/thread.jspa?messageID=9734451&#9734451
If you are running Windows on your Mac or if you send e-mail attachments to Windows based computers, then keep trash the PC Tools and get ClamXav
It's free and easy to use and won't slow your system down.
Carolyn

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