Got my Thunderbolt Display yesterday and hooked it up to my 11" MBA. I'm using an apple wired keyboard and a logitech performance mouse. When the keyboard is connected to the display I experience significant input lag, with inputs sometimes being skipped altogether. I am currently using all the ports on my display except the thunderbolt output. The mouse receiver is unaffected, regardless of whether I plug it directly into the display or into one of the keyboard's USB ports. The lag disappears if I connect the keyboard directly to the MBA. Anyone else experiencing this or a similar issue? EDIT: The lag was somehow related to a virtual machine running WinXP. It would eventually return no matter where I plugged the keyboard. Sorry for the misleading thread. EDIT 2: My WinXP virtual machine seemed to be affecting the keyboard. But the USB ports on the Thunderbolt display DOES cause the keyboard to lag. After some time of use it begins to drop letters or to get stuck on a key.