Slow local network performance for image attachments
jlar310 at gmail.com
Sat Mar 29 00:19:53 EDT 2008
On Fri, Mar 28, 2008 at 10:19 PM, Alain Spineux <aspineux at gmail.com> wrote:
> On Sat, Mar 29, 2008 at 2:09 AM, Jeff Larsen <jlar310 at gmail.com> wrote:
> > I run cyrus imap in a virtual machine at home using fetchmail to pull
> > my ISP mail into a local imap store. For the most part it works great.
> > But with messages that have digital photo attachments it takes a
> > seemingly inappropriate long time for Thunderbird to download the
> > message (over local wired 100Mb network) and display the pictures.
> > I've got plenty of memory overhead on both the virtual machine and the
> > VMware Server host. While in the process of downloading an image
> > email, the CPU usage goes higher than I would expect (20%) for a
> > simple file transfer. It takes 10-15 seconds to load a message with 3
> > images totaling 5MB over non-encrypted port 143. It's 2 or 3 times
> > that long if I use imaps on 993.
> > The VMware host is a 2GHz Pentium, with very little load from other processes.
> First I thing about a probleme with Vmware or hardware (disk access or network)
> Find the file that match your email in your imap spool, and try to
> download/upload it using
> scp on your workstation, and measure the time.
4 seconds via sftp (with encryption) vs. 24 seconds (I measured more
precisely) via Thunderbird imap without encryption.
> Also try using imap client on your server, and other imap client ....
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...
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