Edge Insider Channel versions offer sleeping tabs functionality. I set mine to go to sleep after 5 minutes, works great.

>Using sleeping tabs on Microsoft Edge typically reduces memory usage by 32% on average. It also increases your battery life as a sleeping tab uses 37% less CPU on average than a non-sleeping tab. Although individual device performance varies depending on configuration and usage, we’ve heard from users that this decrease in resource and battery usage has improved their browsing experience.

https://blogs.windows.com/msedgedev/2020/12/09/sleeping-tabs...