CPU drag of video conferences

Just found on a page of Berlin Humboldt university:

Video-Streaming steigert die Anforderungen an die Rechenleistung der Computer der Teilnehmer/innen. Dadurch werden Teilnehmer/innen mit älterer Hardware evtl. ausgeschlossen und zur Anschaffung neuerer genötigt. Dies ist auch eine sozialökonomische Zugangsbarriere, die in der Planung bedacht werden sollte.

Via deepl.com:

Video streaming increases the demands on the computing power of the participants’ computers. As a result, participants with older hardware may be excluded and forced to purchase newer hardware. This is also a socio-economic barrier to access, which should be considered in planning.

https://www.projekte.hu-berlin.de/de/gnuHU/anleitungen/digitale-konferenzen

It is my experience that a dual core CPU of - say 2.8 GHz even has problems to let Jitsi do the job fluently. In a peer2peer connection, even when using chromium. With more participants, at least four cores appear to be necessary.
Compared to e.g. Skype, the CPU load appears to double or a bit more. I’d suggest that Skype’s better CPU efficiency/utilisation also results in far better lipsync performance.

Does the video-encryption contribute significantly to the CPU load? Or is it mainly the fact that the code in an webRTC-enabled browser is not efficient?
Etc. etc.

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