[mikewhy]

Here's a simple comparison using nativefier (electron based single-site-browsers) vs something using WKWebView:

https://imgur.com/oG2Dm5y

Both are playing low-quality HTML5 video.

For any sites I could think of, the memory usage, thread count, CPU time, and idle wake ups were considerably smaller using WKWebView.

The disk usage was also crazy smaller, as is expected. ~122MB for nativefier vs ~14MB for WKWebView (and a lot of that is due to being written in Swift).