Down to ~98ms from the original ~940ms. That's a very respectable gain, but I am still not quite happy with the runtime. At this point, though, I think I will need to re-think my approach rather than making small tweaks.
First round of the lowest of low-hanging fruits to get day 12 runtime from ~1s to ~280ms on my machine in Release. Still not happy with 280ms, so I will probably keep digging.
This was my initial solution I used to submit the puzzle answer. Runtime for part 2 on my input set was around a second, so now I'm going to find optimization targets. I'm sure there's a lot I could be doing much better.
