Why is 64 bit slower than 32 bit

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http://askubuntu.com – I have had this problem for a long time. Now I think I know the reason. I was using 64 bit version of Ubuntu 12.04 and it was very slow. Desktop was a little bit choppy. I could run World of Warcraft on high details in Wine though.(+Compiz funny stuff also water effect). Flash player and JAVA were more laggy than games in Wine. Also I could not play HD videos very well in VLC, in SMPlayer it was much better. Yesterday I accidentaly installed 32 bit Ubuntu and it seems everything is much faster now. Flash is running smooth, I can watch HD movies without any problems. I want to use 64 bit OS as (HowTos)