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I have the same problem. When using PPO with a network of size 2x256 the behaviour in inference was equivalent to the best performance in...
Possible solution: I had this same problem - on playing the scene in the editor, it would run for around 7 seconds, then freeze/lock for about 5...
You can also try turning down the strength of the shadows (under Real Time Shadows in the main inspector). I found this helped a lot with my scene...