There is clearly a maximum library size.

[TheOldPresbyope]

I understand you are trying to queue all your tracks, to then play them.
Apart from the fact that having a queue of 10K tracks is a bit useless, IMHO, there could be more factors affecting the 2.5 hours needed to queue them, first of all disc-speed, LAN-speed. But in the end I see a memory issue here... 11K tracks, with some metadata and coverart, resolve in the same amount of HTML elements for presenting you the queue visually; and browsers do a lot of magik behind the scenes...
Have you tried disabling the local display (just to check...) and trying to do the same via browser interface?

Good point, Al. I completely missed that he was trying to load everything into the queue.

Regards,
Kent