Long refresh on large number of IMAP folders

[domel]

Hi,
I'm using RC 1.4.2 and one of my customers is experiencing slow responsiveness of his mailbox. He has over 4600 folders in his mailbox and the autorefresh takes about 100s. I have enabled imap_debug and there are IMAP operations for every folder, one by one. Then I have enabled the imap_cache on memcached, but that didn't help.
Is this a feature of Roundcube, that it have to query IMAP about every folder on the refresh operation? Shouldn't the imap_cache help on that?

[alec]

https://github.com/roundcube/roundcubemail/issues/7164

[domel]

Thanks for pointig out.