Reproduction steps:
1. Open the attached "ParticleSystemMemory_5.3.7" project.
2. Open and play the "Test" scene.
3. Go to Window > Profiler.
4. Select Memory.
5. Change Simple to Detailed.
6. Click Take Sample: Editor.
7. Expand Scene Memory.
8. Check the ParticleSystem memory usage.
- 5.3.8f1: 8.9 KB
- 5.4.5f1: 8.6 KB
- 5.5.2p2: 32.4 KB
- 5.6.0b11: 37.3 KB
- 2017.1.0a3: 37.3 KB

Regression introduced in:
5.5

Reproduced in:
Editor, Standalone, iOS