[RCD] Next performance improvement

[A.L.E.C]

Next version with small fix. Please, someone check the patch with 
enabled caching. In my opinion, it can be commited to trunk now.

-- 
Aleksander 'A.L.E.C' Machniak http://alec.pl gg:2275252
LAN Management System Developer http://lms.org.pl
Roundcube Webmail Project Developer http://roundcube.net



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