I've been playing with this and trying to time it, but get very
inconsistent results. With all genres selected, the initial list
populates in under a second, which is as expected. But I'm seeing
anything from 5 seconds to as long as 45 when a subset is chosen.
Typically, it's about 12-18 seconds. I have about 40k tracks and 38
genres in the library.

Repopulating the list doesn't seem to take long at all, either adding
that one song after one has played, or if I jump to the last song and
force it to add 10 new songs (using the default setting) it seems pretty
quick.

I haven't examined the SQL, but if it is using IN (set) then I just
realized that 

WHERE genre IN (1,6,7,8) AND genre NOT IN (2,3,4,5,9,10)

would be equivalent to simply

WHERE genre NOT IN (2,3,4,5,9,10)

Maybe that would be faster.


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