When 'Run Dedicated Server' is unchecked and you run PIE with 2 or more clients, all client's animations are stuttering on Game Preview Server window. This does not happen when Run Dedicated Server is checked.
This was working as intended in 4.19.2 (CL-4033788). This was reported and tested in 4.20 (CL-4212847) and reproduced in Main 4.21 (CL-4234136).
Results: All animations are stuttering and lagging only for the server side.
In client windows there is no such problem.
Expected: Animations are expected to work smoothly for server and client's side
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-62225 in the post.