This is a regression introduced by the particle system manager. It does not account for the owning actor's time dilation when ticking the particle system components. 

Steps to Reproduce
  1. Create a new particle system
  2. Create a new actor
  3. Add a particle system component to the actor
  4. Set the particle system component's template to the system from #1
  5. In the actor's construction script set its custom Time Dilation to .1
  6. Place the actor in a level


The particle system will simulate as if the time dilation were 1.0.

NOTE: If you disable the particle system manager with the command  "fx.PSCMan.Enable 0" it will simulate at the owning actor's time dilation. 

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There's no existing public thread on this issue, so head over toAnswerHub just mention UE-88322 in the post.

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ComponentRendering - Cascade
Affects Versions4.224.234.24
Target Fix4.25
Fix Commit11294253
CreatedFeb 7, 2020
ResolvedFeb 7, 2020
UpdatedFeb 26, 2020