Developer Notes

This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.


It seems that Particle CPU cost highly increase at second "show" of a streaming level.
The Licensee's team sent a sample to reproduce this problem.
So I put the project and wrote how to reproduce on this thread.

Steps to Reproduce
  1. Open attached project.
  2. Press 1 to toggle stat unitgraph and particles
  3. Press 2 to load a streaming level that has a emitter of mesh particle.
  4. Press 3 to show the sublevel.
  5. Press 4 to hide the sublevel.
  6. Press 3 to show the sublevel again.
  7. You can see the stat graph and some particle counters increase more than at the first time "show".

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Won't Fix
ComponentUE - Rendering
Affects Versions4.94.104.12
CreatedFeb 24, 2016
ResolvedFeb 15, 2017
UpdatedApr 27, 2018