About twenty days ago it came to my attention via my colleague Ed Morley that BMO’s bzapi was very slow.
It turns out he had reported the same issue the prior year as well!
Performance problems are very enjoyable to work on, I find. Especially when they are reproducible.
I lost most of the day on this, but in the end I was able to take the slowest function from executing at a leisurely 226 seconds to a very fast 184 milliseconds