cyrus imap slow on Fedora 13&14

[Damijan Senc(ar]

Hi!

I migrated cyrus imap server  from an old fedora to Fedora 13
(cyrus-imapd-2.3.16-3.fc13.i686).
Works well and fast in  LDAP+Postfix+sasl environment from Thunderbird
client.
The problem is when user read big mail boxes (e.g. 1000+ mail in one
folder) from webclient (Squirrelmail) installed on same or other server.
The same squirrelmail installation (I only changed imap server address)
worked well in combination with older cyrus installations.

Now I tried to find out what is wrong and only thing I found is that
during reading mail from imap server from web client top command shows
on imap server 100%wa!
I tried fresh installation on F13 with same outcome.

An idea what could be the cause of that problems?

Thanks,

DS