[imp] login slowness with large inboxes after upgrade from Horde 3.0.10+IMP 4.0.4 to Horde 3.3.8 + IMP 4.3.7

[Jose Manuel Blanco]

Hi

After I recently installed in my new server Horde 3.3.8 + IMP 4.3.7, 
users with a large inbox take around 4 to 5 minutes to login.
I know this has been reported and I have read the PERFORMANCE document 
and all I could find on the web about increasing the cache (horde_cache, 
memcache, mysql memory, etc). The problem is
that my configuration is almost identical to the one I had before 
(except the server is newer and I can set bigger cache values). Even more,
with my old webmail, logins of users with more than 40000 mails in their 
inboxes were almost instantaneous (even the first time they login), so 
it looks
to me as if it's not a cache issue. Could it be that my old server is 
only refreshing from the IMAP backend the 20 mails it shows in the first 
screen, while the new one is trying to download the whole 40000 headers? 
If so, I haven't been able to see what parameter could be changed to 
make my new webmail to behave like that, and that's the only logical 
explanation for my old webmail behaviour that I can think of.

Thanks in advance

Jose Manuel Blanco


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