How to reproduce:
1. Open the attached project's Scene labeled "SampleScene"
2. Enter the Play Mode
3. In the Game View, inspect the shown FPS count
4. Press and hold the "F" key
5. Inspect the shown FPS count again

Expected result: Holding the "F" key shortcut doesn't affect the performance when Scene View is hidden and the Game View is opened
Actual result: Holding the "F" key shortcut affects the performance significantly when Scene View is hidden and the Game View is opened

Reproducible with: 2018.4.25f1, 2019.4.4f1, 2020.1.0b16, 2020.2.0a18

Note: Other key presses affect the performance at less than half of the impact on FPS than the "F" key