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Topic: Roundcube has become slow and can no longer be operated in some cases

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.8 OPENLDAP edition
- Deployed with iRedMail Easy or the downloadable installer? installer
- Linux/BSD distribution name and version: Ubuntu 20.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi,

as described above. Everything worked fine for a long time but since some days my users can't really use Roundcube. Imap works fine with other clients.

Here comes an output of the PHP FPM log:

 WARNING: [pool inet] child 707, script '/opt/www/roundcubemail/index.php' (request: "POST /index.php?_task=mail&_action=refresh") executing too slow (12.332153 sec), logging

I already made an update to the newest Roundcube-Version 1.6.9 but with no positive effect.

What could be the problem?

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