Dec 10 2020 04:14 PM - edited Dec 10 2020 05:16 PM
This feature is behind a flag, and just added to Microsoft Edge Version 89.0.730.0 (Official build) canary (64-bit)
you can enable it using this flag: edge://flags/#intensive-wake-up-throttling
Throttle Javascript timers in background
When enabled this feature causes Javascript timers in background tabs to be aggressively throttled and coalesced, running no more than once per minute after a page has been backgrounded for 5 minutes or more.This is a web standards compliant feature, but it may break functionality on some websites by causing certain actions to be delayed by up to a minute. However, it results in significant CPU and battery savings when enabled. – Mac, Windows
this is an additional feature to the optimizations that Edge already has, or features such as sleeping tabs.