The save we have is SE + K2, and I've got a massive train network of intersections with all-left-turns to help prevent train lockups; just recently it started taking a really long time to calculate train pathing for some reason - this happens intermittently:

The total Trains value reaches 10-11 sometimes, then falls back down to 1 / 1.2 and is fine for awhile, then spikes again. This is a dedicated server hosted at Bisect.
I have a ton of trains and a ton of track, but I'm not sure what changed all of a sudden to cause this much lag?
Save:
https://drive.google.com/file/d/186KPnV ... sp=sharing