Mozilla recently published a good write up on why they started using these undocumented CALayer API's in Firefox 69. The TLDR is that that these private API's

Mozilla recently published a good write up on why they started using these undocumented CALayer API's in Firefox 69. The TLDR is that that these private API's allowed them to get up to 3x better battery usage in Firefox. The article also mentions that Chrome uses these same Core Animation API's. https://mozillagfx.wordpress.com/2019/10/22/dramatically-reduced-power-usage-in-firefox-70-on-macos-with-core-animation/ https://mozillagfx.wordpress.com/2019/10/22/dramatically-red...