This bug occurs in 5.3 version. It's ok in 5.2 version.
Method to Reproduce Issue One:
Method to Reproduce Issue Two:
From the performance point of view, it seems to be the same issue.
(A 5.3 example project is attached below.)[^MyProject.zip]
You can also check this UDN:
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-200463 in the post.