How to reproduce:
1. Open the project attached by the user (2018.3.zip)
2. Open the "Done_Main" Scene
3. Open the Inspector Window, press on the "Test" GameObject in the Hierarchy
4. Play the Scene, scroll up and down quickly in the Inspector Window
5. Notice the performance spikes in the Game View and the Inspector Window itself

Expected result: The Editor does not worsen in performance
Actual result: The Editor visibly worsens in performance and stutters

Reproducible with: 2017.4.0f1, 2017.4.12f1, 2018.1.9f2, 2018.2.11f1, 2018.3.0b4, 2019.1.0a2

Notes: The performance issues seem to increase depending on the amount of components attached to the GameObject viewed in the Inspector