Slow local network performance for image attachments

[Rob Mueller]

> Squirrelmail on localhost:. very fast, in the blink of an eye,
> likewise with Outlook Express (perish the thought).
>
> So I guess it's Thunderbird. That sucks. I guess I'll take this to a
> Thunderbird forum. Thanks for pointing me in the right direction. Some
> days after troubleshooting everyone else's computer problems, there's
> nothing left in the tank for my own...

These are a little old, but it's possible they still apply. The default 
settings for Thunderbird IMAP handling with large emails with attachments 
sucks... badly.

http://bleedingedge.com.au/blog/archives/2005/11/waiting_for_thunderbird.html
http://bleedingedge.com.au/blog/archives/2005/11/speeding_thunderbird.html
http://bleedingedge.com.au/blog/archives/2005/11/making_thunderbird_fly.html

Rob