Several months ago several users were searching for solutions to Focus Stacking taking an eternity to complete on the PC
I'm pleased to note that the bug has been fixed with the latest update, you know the bug they said they never had. The one that made an insanely fast PC take 30minutes to stack 5 layers while a 10yr old MacBook took less than 30 seconds for the same file... I've been struggling with this for over a year now (along with many other users who were simply told by Adobe that their graphics cards weren't powerful enough). With most graphics cards listed as GTX1070 and stronger, we strongly disagreed.
I don't know why Adobe doesn't listen to their consumers more ... we use their products, we know when there is an issue! I personally have been using Photoshop since before it became CS anything (over 20 years). Stop treating your clients as if they are idiots!
It starts processing the focus stack, then hangs about a 6th into the progress bar . . . and there it sits
in the meantime, Ive switched on my 12 year old MacBook, loaded photoshop, imported the layers, aligned them and focus stacked them, saved back to my server. Force Quit Photoshop on the PC, re-launched it and opened up the stacked file again.