How to explore what Visual Studio is doing when it

Question

I'm updated to Visual Studio 2015 last week, and I'm very disappointed about the performance. In the earlier versions it was also usual that time to time the IDE just hangs and constantly uses CPU about 30%, but in this version it's so often that I'm getting mad of it.

Is there any way to determine what is doing what? I only see devenv.exe in the task manager constantly using 30-40% of CPU for almost 30 mins, 3-4 times during a workday. I want to see what is going on. If I could see some details, I would probably be able to disable some feature or extension, etc.

Any tips are appreciated.

UPDATE

My question is kind of general, but just for the record.

• I experience it mostly when I'm editing TypeScript files in a large TypeScript project. But also it happened several times inside a standard C# class library project.
• TypeScript compile on save is disabled.
• TypeScript version is 1.8.7 or so (latest).
• I have ReSharper installed, Solution-wide analyzis is turned off.