Is anyone else having this issue with their Magic Trackpad on Yosemeti, specifically on their IMacs? I can't say its the trackpad, because I've tried the magic trackpad on my Macbook and my wife's Macbook Pro and it does not exhibit the same problem. The problem at hand is that when moving the pointer around it lags so much it exhibit a jumpy behaviour as it tries to catch up and most of the times it skips so much it jumps form one side of the screen to ther other. Any ideas? Again, I'm attributing this to my IMac on Yosemeti. I've tried PRAM reset and switching the batteries and also turning off Time Machine. Thanks.\ I might even go as far as saying that the Keyboard is also lagging when typing. I've noticed a slight delay here too.