I forgot to post this user report from the testing session I organized on August 24th:
Based on tonight’s test, my laptop maxes out at 100% CPU with about 80% being associated with browser supporting Jitsi session. On Firefox, performance was so bad that the mouse became unusable for periods of time. On Chrome it still maxed out CPU but performance not as bad. My laptop is a Lenovo Thinkpad Yoga 11e with Celeron N3150 , 4GB RAM, running Windows 10, latest update. On my faster Windows 10 desktop, CPU was below 50%. I note that when using Zoom application (not Web based) the same lower powered laptop performs OK. Hope that is useful.