I'm taking Greek, so we have to do a lot of manual parsing. To aid in this I usually copy and paste the Greek word and its lemma into an excel doc. When I do this in v3 it is snappy, instantaneous, and there is no draw from the CPU. However when I do this in v4, my 3GHz quad-core CPU goes nuts anywhere from 20-50% usage for each right-click.
It is faster when the "Selection" item is used than when the "Lemma" menu item is selected, but either way there is a definite lag and the processor is heavily used.
For a right-click menu this seems to be a serious problem. What use to be quick right-click, copy, paste is now a right-click, wait a second, copy, paste. When you're trying to do this with 50+ words the lag gets old real fast.
I hope this gets optomized soon!