Freezes when logging out/exiting game

Hello,
Everytime I log out/exit game, I get freeze for 10-50 sec untill I finally log out/exit game (I cant alt+tab during this freezes). I have every video setting on ultra, my addon memory is 12MB. I have tried to turn off all my addons and there werent any freezes, BUT on other servers I can have same addons with no freezes. Does someone know how to fix it? I know players who have lowe PCs, ultra video settings, 20-30 MB addon memory and they have no freezes when log outing.
Thank you for all replies :)

have same problem, no solution so far it seems