After Visual Studio opens the solution, the pop-up box displays "opening the file ...".

After Visual Studio opens the solution, the pop-up box is displayed."Opening file ..."The task manager's devenv process is normal and will not be displayed"Not responded".

In the lower left corner of IDE"Waiting for analysis to complete ..."Prompt.

At the beginning, I thought it was a vs plug-in problem, because after I installed a plug-in, I restarted Vs and opened the solution to this problem, so I thought it was a vs plug-in problem.

Later, I uninstalled the vs plug-in./Resetaddin /Resetskippkgs /ResetsettingsThe devenv command can also be tried once. The omnipotent 3 R command combination is known to be ineffective in solving various problems of Visual Studio.

I started to remove files from the project, disable Visual Studio IDE, and put all projects in *. csproj. all user files are deleted , and the IDE returns to normal miraculously, with great smoothness.