I find the slow speed of menu display very annoying.
The right click context menu is especially slow. I just ran a test on the NASB and it took 50 seconds to fill in all of the menu items the first time. Subsequent times it takes 7-8 seconds. This menu should pop right up so you can do a quick inquiry about one word after another. It appears to try to scan your library to see what would be relevant and that takes too long. I would like to suggest that the programmers cache the basic content for a given book so that after the right click is done once for a book, it would pop up rapidly the next time. Things like the top 5 resources and basic menu options will not change for a book, no matter what word you are looking at. You could display these instantly so the user could pick them and then add the interlinear information gradually. It will create a much more satisfying user experience.
The same problem happens with the basic menus. I don't know why it should take 2 or 3 seconds for the Guides or Tools menu to pop up. Even though the searches are faster, all of these slow menus create a general feeling of a lack of responsiveness on the program and give the impression that the program is slower than version 3.