1. I am running training with --no-graphics, yet I still hear the in game sound. Is there a way to build the game without sound? 2. I also tried building the game with "Server Build". Will it make the game run faster for training? 3. I am training with --time-scale 50 yet since I can hear the sound the game still runs real time with the compiled build. If I train in the editor everything works, and it trains faster than real time.
To get the best performance, I would generally disable all game features that aren't required for training, incl. sound. Audio isn't affected by timescale and always plays in real time AFAIK, since it runs on its own thread.