Everything was perfect and suddenly on Visual Studio 2019 .net core 2.2 project - add new folder, add new file on that folder is too slow, also have "Not responding" for a second.
I hade the same problem on other project, also didn't found solution.
Right click on any folder in the project -> add new folder - 6 seconds + 1 sec Not responding Rename that folder - 7 seconds + 1 sec Not responding The same as add new .cs
Also search in google a lot, all the comments from Microsoft - thank you for the feedback...