On my installation (7.1.4.1389 on Win XP) the first right click goes fast - the next clicks will bring the pop-up with a short delay. However, this only seems to happen in the program windows.
I'm having the same slow-down problems on my XP setup.
Is there a known bug in 7.1.4.1389 in the area of query hints? I've not seen this problem on any previous version of Developer, so I'm assuming that this in not directly related to my database access.