Microsoft is claiming Edge Stable 89 has significant start up speeds and battery saving, especially when using sleeping mode tabs.

Experimentation in the Stable channel, comparing Microsoft Edge with startup boost enabled versus not enabled, shows startup times improve ranging from 29% to 41% when Startup boost is enabled*.

latest Insider testing in Microsoft Edge typically increases battery life as a sleeping tab uses 26% less CPU on average compared to a non-sleeping tab. It also reduces memory usage by 16% on average.

[blogs.windows.com...]