Not sure if a bug or not so filing under Misc.
Am grouping ~100 workspaces together, the creation and manipulation of these is pretty quick, but the grouping step takes over a minute. Don’t know if this is expected or not
Out of interest how large are the files you are trying to Group? Works fine to group 200 small files.
I did have ~40Mb files, but have a similar issue with more (700) but smaller ~2Kb files
The 200 files I grouped were about 10 MB