My work computer is an older machine that comes to an absolute crawl when opening up Visual Studio 2015. One thing I did today to speed things up is to disable Codelense.
What is Codelense? It is that new feature where if you are working in a team environment when you open up code you can see who created various pieces of code and how many modifies have happened to it and by who, plus probably other stats I'm unaware of. All fine and good but at the cost of a lot of performance I don't want it.
To disable Codelense-
Tools->Options->Text Editor->All Languages->Codelense.
Why Codelense is under Text Editor and all languages doesn't make a lot of sense to me but whatever.
This might help speed things up for you. Happy coding.