Phone slow during ActiveSync

[Ciege]

After plugging the phone in to the computer and having ActiveSync run or while already plugged in and ActiveSync starts my phone runs really really slow.
Say I have the Start -> Programs screen open. I can kick off ActiveSync manually from the computer by right clicking the ActiveSync icon and clicking synchronize. When the sync starts (arrows are moving) if I try to close the Programs dialog or even open a new application I have seen it take anywhere from 3 - 10 seconds to respond.

The above scenario is forced, but I usually leave the phone plugged in while at my desk. If I want to do something, anything and sync happens to be running at that point there is always a long delay before the phone responds to what I want to do. As soon as the sync is completed everything moves along quite spryly.

Anyone?