I tried third person template project and met the same problem. It worked for about 30s and suddenly cpu rised a bit and gpu dropped to 20% and fps dropped to 20. For my own project, fps dropped to 3 after less than a minute as well.
The issue only exists on 5.2 and 5.3. So I moved pixelstreaming plugin from 5.1.1 to 5.2.1 and switched to webrtc 4147. Now it’s finally working again.
BTW, the default fps is unlimited in UE5 while 60 in UE4, -PixelStreamingWebRTCMaxFps doesn’t work as before.
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