Ever since I started using the 4 branch of Roundcube, I have been having performance issues.
it appears to be with Roundcube and Dovecot Sort.
When the date column is visible, Roundcube can take up to 30 seconds to display an inbox with less than 1000 messages.
When the date column is turned roundcube is incredibly fast again.
Messages display instantly.
Is roundcube doing the sorting in the .4 branches?
My server is Dovecot 1.2.6 and it supports Sort and Thread.
The .2 and .3 branches were much much faster.