The several spikes in your CPU usage originate from the “Recurrent neural network for audio noise reduction” audio processing filter that eliminate ringing during a multi party call.
You can experiment with disable some audio processing options in the config.js:
// Disables all audio processing disableAP: true, // Disables Acoustic Echo Cancellation disableAEC: true, // Disables Automatic Gain Control disableAGC: true, // Disables Noise Suppression disableNS: true, // Disables Highpass Filter disableHPF: true,
Without the audio processing you will hear feedback loop noise from speakers to microphone. The feedback loop noise can be avoided if everyone are using headphones .
Disable of all audio processing is also OK if you only have one speaker and everyone else listen with mic turned off.