wow freezes on 32 bit

When playing wow on 32 bit, every 10-20 seconds the whole screen freezes for like half a second or less then goes back to normal. It doesn't happen on 64 bit. I'm using windows 7 ultimate 64 bit and running 32 bit wow from the hb launcher. Does this happen to everyone, it does it on 2 different computers. It does it with or without HB running I just thought I would check here to see if it happens to anyone else or if anyone knows how to fix it since everyone here must be using 32 bit to run HB.

thanks

wow freezes on 32 bit