A new and updated Cider Wrapper increases the performances with ~25%. 


More info:  
http://na.leagueoflegends.com/board/showthread.php?t=1058418  
http://euw.leagueoflegends.com/board/showthread.php?t=132051

All kudos go to Drakulix


Known Issues:
-There can appear up to 5(!) LoL Icons in the Dock. One for each process (rads_user_kernel, LoLLauncher, Adobe AIR, PvP.net, LeagueofLegends.exe),
the LoL cider does not display all of them. But with this Cider version I cannot fix this behavior.
-Also the client may crash on the very first start, before the Updater gets displayed. Just quit it and ran the game again, should work after that.
(tested 3 times, 2 times the first start did not work, there is a wired error about a failure in the rads_user_kernel self update log file. When it did work one time, the selfupdate will not run again, until a new version gets released, so it should really just happen the first time and after some big patches.)