[imp] Improving IMP message load times

[Mat Cantin]

Greetings,

I currently have Horde4 groupmail installed and operational on  
Lighttpd with the Dovecot IMAP backend for email and authentication.  
I've been working on trying to improve IMP's performance when loading  
new messages that have not yet been viewed and cached. I've been able  
to get it down to about 3 seconds, which I understand is pretty  
typical because that's how long it takes to establish a new IMAP  
session and download the message.

Although 3 seconds is good, when my users want to look through several  
new messages quickly, it's really not that great, especially when  
comparing the performance with Google Mail and Outlook Web Access.

Getting to the point, I've noticed that once a message has been viewed  
and cached, going back to that message later is instantaneous. Does  
anyone know if it's possible to configure IMP to pre-cache all the  
messages in the current view? Ideally, it could quickly load and show  
the user's message list and then proceed to download the messages in  
the background. I realize that this will obviously take more server  
resources, but that's a trade-off we can make.

Thanks.

-- 
Mat