We replaced this with the local file streamer as the default (it performs the file operations on another thread) in 4.23.
In 4.22 , the FFileHandleWindows.Flush was override and implemented, so it will cost a lot of time every tick time when recording.
Profile in 4.22:
Profile in 4.21
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-75952 in the post.