Jitsi server setup - Trying to improve video call quality

I am able to successfully setup Jitsi server locally and could arrange video conference.

However, I am concerned if it would be smooth if number of participants increase beyond 40 (< 100).

Going through the forum I came across few settings which could help improve the smoothness

DISABLE_JOIN_LEAVE_NOTIFICATIONS: true,
DISABLE_FOCUS_INDICATOR: true,
DISABLE_DOMINANT_SPEAKER_INDICATOR: true,
DISABLE_VIDEO_BACKGROUND: true

I tried modifying DISABLE_VIDEO_BACKGROUND but couldn’t see any difference. Could anyone please let me know what all these parameters do.

Secondly, is there something more we can add on top of this to have smoother experience.