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When I click main menu button in Windows, it loads instantly. When I click K menu, it loads with a small delay. Seems, that it's loading data from disk. How to make it cache the favorites in memory?

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Are you sure it's not the desktop effects and window animations causing the delay? And try to see if it is really disk I/O using iotop or iostat. I'm using KDE and not experiencing any delay in opening it with a lot more entries in Favorites. – gertvdijk Nov 24 '12 at 13:05
up vote 0 down vote accepted

To solve this problem go to System settings -> Desktop effects

and uncheck Sliding popups animation

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