This is something I've been dealing with tolerantly for years across multiple versions and I am just finding the time to post about it.
When typing ALT-2 or ALT-3 to set a star rating, the keystroke is often slow to be acknowledged and often is ignored altogether, even when you sit and wait. Surely there's something that could be done to whatever code is monitoring keyboard input or applying star ratings to make acknowledgement of these keystrokes more snappy.
Using V 6, build 5820 at the moment.