[Dovecot] Speed up mail retrieval by keyword

[Manfred Usselmann]

Hi, 

I' m using a roundcube plugin for adding attributes to mails, which are
stored as IMAP keywords (https://github.com/umount/message_label [1]). 

This plugin allows me to retrieve mails with a certain attribute across
all my mail folders. 

Selecting mails this way is very convenient, but also very slow,
probably because I've got a lot of mails and folders. 

Is there a way to speed this up somehow by changing any configuration
options? 

Versions in use are Roundcube 0.9.0 and Dovecot 2.1.10 (Maildir).

Thanks

Manfred



Links:
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[1] https://github.com/umount/message_label