Limit Video streams on Custom UI using low level jitsi meet api

Hi,
We have developed our own UI using low level jitsi api, but after about 30 participants join, the web browser is hanging. By checking task manager, it seems it is still taking all of the participants video feeds, even though there is only 7 feeds displayed at any one time. Would muting the local video track for the participants not in view, a) reduce the video bandwith on the jicofo object and b) reduce the memory on the front end? if not what other options are provided by jitsi or configuration settings to achieve this?
Thanks