BUG: 205448
BUG: 205448

find a better compromise between search speed and responseness of the ui (empirical result)

svn path=/trunk/KDE/kdepim/; revision=1017919

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi