When Animator Window visible - it uses 10 - 20 % of CPU

2) How can we reproduce it using the example you attached
1 Create new project or use attached (scene testScene)
2 Create cube
3 Open animation window and create new animation clip
4 Press "Add Curve" and add Cube:Position
5 Save the scene
6 Open Task Manager (on Windows) and in Processes tab find Unity.exe and notice that it uses 00 - 01 % of CPU
7 Create new scene - notice that Unity.exe uses 10 - 20 % of CPU
8 Make Animator Window not visible (by opening some other tab) - notice that Unity.exe uses 00 - 01 % of CPU again
9 Make Animator Window visible again - notice that Unity.exe uses 10 - 20 % of CPU again

Please see attached video