To reproduce:

1. Download attached project "ProfilingTest.zip" and open in Unity
2. Open "scene" scene
3. Select Cube
4. In Inspector find "Update Controller" script and in Update info > Garbage Info set to "Make Garbage" to True
6. Run logcat
7. Build and Run the project on a Device with a Development Build and Autoconnect Profiler checked
8. Take an example of a Profiler
9. Turn off Application and clear logcat
10. Select Cube
11. In Inspector find "Update Controller" script and in Update info > Garbage Info set to "Make Garbage" to False
12. Run logcat
13. Build and Run the project on a Device with a Development Build and Autoconnect Profiler checked
14. Take an example of a Profiler
15. Repeat 3 - 14 steps with every device - LG G4, Pixel 2 and iPhone 6s

Notes:
- Logcats are shared in the Comments section
- Profilers images are shared in the Comments section
- We do not have OnePlus 5 so I tested on Pixel 2 XL
- If we look at non-allocating screenshots LG vs Pixel 2 vs iPhone 6s, then we see that LG is slower and is more erratic / spikier
- If we look at the allocating screenshots LG vs Pixel 2 vs iPhone 6s, then we see that LG is still slower and is much more erratic / spikier
- Pixel 2, in general, is very stable and smooth
- iPhone 6s, in general, stays smooth but with the occasional large periodic spike and sometimes come upon troughs of even less time being consumed

Devices:
- LG G4, OS: 6.0, CPU: arm64-v8a, GPU: Adreno (TM) 418
- Google Pixel 2, OS: 8.1.0, CPU: arm64-v8a, GPU: Adreno (TM) 540
- iPhone 6s, iOS: 10.3.2, CPU: A9

Reproduced on Unity 5.6.5p4, 2017.1.3p3, 2017.2.2p3, 2017.3.2f1, 2017.4.1f1, 2018.1.0f1 and 2018.2.0a9