[Dovecot] Dovecot performance under high load (vs. Courier)

[Wojciech Puchar]

>>
>> Asking for items 600-615 from a threaded list, sorted by something, can be an expensive operation, especially if you just asked for items 585-600 a moment ago?
>
> Can be, but is it? :) Dovecot attempts to cache/index stuff as well. Normally there shouldn't be a need for extra caching layer except in cases of higher network latency.

that is my point. and - esp. with webmail, i see no point to run such 
service in different place than dovecot server runs. Best - same server. 
Maybe - other server connected with fast LAN.