I noticed this too dokcal. I tried to slice this item: https://www.printables.com/model/554709-nasa-fabric/files. It was the 12x16 size and it took about two hours to slice. I've done bigger and more complex prints and I've never had it take more 5-10 mins. This was also when I was using version 5.4. There has to be some new issue with this new software version. I'm going to try some things on 5.4 tonight and tomorrow to see if I get the same delay/stall again.