[imp] Large attachments timing out.

[Kevin Konowalec]

Horde: 3.1.2
Imp: H3 (4.1.2)
Turba: H3 (2.1.1)
PHP 4.4.1


Has anyone had problems with Imp taking a VERY long time to download  
attachments?  We have been doing some testing and with 3 users  
downloading large files simultaneously (~14MB each) it takes in  
excess of 5 minutes for the file to download.  Safari doesn't seem to  
have a problem with this but IE and Firefox both seem to time out at  
EXACTLY 5 minutes.  I went into the Firefox about:config settings and  
set the two timeouts I could find to over 300 seconds (300 was the  
default) and restarted but it still times out at 5 minutres.

In the apache error log I get:

[Fri Nov  3 11:30:11 2006] [info] [client xxx.xxx.xxx.xxx] send timed  
out
[Fri Nov  3 11:30:11 2006] [info] [client xxx.xxx.xxx.xxx] client  
stopped connection before rvputs completed

So the questions are:

A)  Why does Imp take so long to deal with large attachments?   
Mail.app, for example, downloads the 14 MB attachment in SECONDS on  
our network.  What is imp doing that takes so darn long?  Is it  
possible to improve on this?  I notice that when a download starts  
the httpd child that is handling the request immediately consumes  
100% of available CPU and continues to do so until the file actually  
starts downloading.  When you start multiple downloads it splits the  
available cpu between the processes but it still flatlines it.

B)  If it's NOT possible to improve the performance on downloads what  
can I recommend to our clientele in terms of tweaking their firefox  
or IE installations?