I will try to describe my situation. Last year I changed my default desktop from Cinnamon to XFCE and was very happy with the change.
But lately I noticed that in some applications, for example GIMP to activate the option to open a file takes more than 20 seconds to appear. The second time I do it does not take so long, but if I close the application and do the same, again it takes time to open the dialog box.
I suppose it's conflict between XFCE and what's left of Cinnamon, but I'm not sure.
Any suggestions will be appreciated.