[RCU] Large inbox slow

[List]

We are hosting a webmail service using roundcube 0.8.1 and a number of 
our users with inboxes in excess of 8000-10000 messages are experiencing 
extremely slow response times (We also downloaded a recent copy and it's 
just as slow).  We are using Dovecot 2.1 as the IMAP server and have not 
had any issues with clients like outlook or Thunderbird, but as far as 
we understand it those clients keep a local copy of the messages for 
quick retrieval while Roundcube is doing everything over IMAP.  Is there 
any thing we can do or should look at to improve the response times for 
loading an inbox with many thousands of messages?

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