For some reason the selection of the items in the morphology menu seems to have slowed down in a recent beta. When I enter @ in a morphology search, I used to be able to click on a part of speech (e.g .Verb) and the various morphological elements would pop right up.
Now, when I click on Verb, it from 2 to 5 seconds for the second menu to pop up with other morphological elements. One time I waited 20 seconds while the hard disk churrned very hard and I thought perhaps it was doing a "speed search" on all verbs. After a while it displayed a large search list and the second menu morphology never appeared.
The interesting thing is that if I enter @ and then V, the second menu pops right up. It is only when I click on the word "Verb" in the first menu that the second menu is slow. It also comes up more quickly after I have entered a few morphology searches, although never as quickly as if I just enter @V from the start.