OK, that is not a crash. Terminology matters a lot here!
I'm a bit lost as to the actual problem/symptoms/cause, as the thread discusses several different issues now. (Please don't do that; it's very hard to follow and we use URLs for issue tracking as well.)
If you make some process snapshots while the delay is happening, we can probably use those to see why it's taking a long time, and if it's getting stuck somewhere or just hitting a situation that is very slow (and potentially could be sped up, once we locate it, assuming it's in Opus itself).