Why PixelStreaming(5.2) FrameRate is lower than the others?

Development Programming & Scripting C++
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5.2 PixelStreaming in Local Player(ThirdPersonMap and Default Settings) FrameRate is lower than the others.
5.2 → 150 Framerates at One Instance
5.0/5.1/5.3 → 180 FrameRate at One Instances

why??