Editor FPS drops from >200 to <60 when there are GameObjects with particle system selected. Also CPU usage seems more unstable (refer to attached image)

Reproduction steps:
1. Open attached project
2. Open the scene Nuclear
3. Open profiler
4. Enable Editor profiling
5. Select all game objects in the scene

Cpu usage increases and becomes less stable
Drops to ~2-3 FPS on 2017.2.0a1 onwards

Reproduced on: 5.5.4p2, 5.6.0a1, 5.6.3f1, 2017.1.0f3, 2017.1.0p2, 2017.2.0b5