Windows 10, totally up to date. All the usual suspects accounted for.
Downloaded Groupy on 3/25/19. Rebooted after install. Beginning about 3/27, noticed Word and Excel, (where were applications where I had grouped tabs) took over a minute to load. I mentioned this to my colleague who had recommended Groupy to me, and he did not have this problem.
Checked forum and Googled for similar problems, could not find anything. On 4/3 (two days ago), was fed up and uninstalled Groupy. Rebooted, and Word & Excels are now starting in seconds.
The only evidence I have that Groupy was the problem was that when I uninstalled it the problem went away.
I also encountered the same problem as "Bug with Groupy and Excel Spreadsheets" (https://forums.stardock.com/491743/bug-with-groupy-and-excel-spreadsheets).
Groupy is a great idea but because of the issues I encountered, it is unusable.