I broadly agree, but you lost me at Figma being fast. Granted I am using an older MacBook Pro (2015), but using Figma in a browser usually requires that I close other apps to let Figma do its thing. Figma and Miro are the only sites I have encountered that incur this level of performance hit.

Incidentally, mightyapp.com was founded to make browsing less resource-intensive by doing the rendering in the cloud. They highlight Figma and Miro (among others) prominently, so it seems others have similar experiences with Figma.