[Slicing "stalls" in Cura 5.5]

Looking forward to a fix!

Just to increase the database, I'm running Win 11 on an AMD Ryzen 9 5950X (also not overclocked) with 64 GB of DDR4, slicing for a heavily modded Ender-3 Pro.

 

I can't legally include the file I was slicing, but it's a plate of nine "dungeon tiles" for tabletop gaming (squares of stone flooring with attached walls). In 5.4, it takes 1 min. 5 sec., but in 5.5 it takes 5 min. 47 sec.!

[Slicing "stalls" in Cura 5.5]

I noticed that my slicing takes MUCH longer in Cura 5.5 than Cura 5.4--and in some cases doesn't complete at all!
 

I'm not sure what's behind this--even the same Project file will take longer to slice, with absolutely no changes.

Is 5.5 doing something extra behind the scenes that takes up loads of computing cycles?