Dovecot Director scaling / performance

[tim at linux-daus.de]

Hi,

currently i'm going to evaluate the Dovecot Director. Are there someone with experience how the Dovecot Director does scale? 

The last current information i could find was a post on this mailing list from 2012: 4 Directors are well known, >75 are too much.

Are there any more up to date experience regarding how many user (current and new/s) a single Dovecot Director/proxy  node could handle and how many director nodes in a ring are known to work (well)?

Best regards,
Tim