The current state of the documentation for Performance Tools main topic looks like a copy/paste bug. This is for the link: https://docs.unrealengine.com/latest/INT/Engine/UI/LevelEditor/PerformanceTools/index.html
It reads:
Performance Tools
At the top of the Level Editor window, at the right side of the Tab Bar, you will find a series of performance and debugging tools.
From left to right, they are:
PerformanceTools.png
Number Name Description
1 Console Command Bar This text field is used to input console commands within the editor.
2 Source Control Status This shows the current status of the integrated Perforce server.