Microsoft is working on a way to limit Edge’s RAM usage. It appears to be primarily for PC gamers, with a RAM slider to control usage.

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The Verge

Microsoft Edge is developing a new feature that allows users to limit the amount of RAM the browser consumes. This feature, aimed at PC gamers, includes a slider to adjust the RAM usage. However, setting a low limit may affect browser speed. The feature is currently in testing and no release date has been announced.

Microsoft Edge will let you control how much RAM it uses soon

Just in the TLDR:
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However, setting a low limit may affect browser speed.
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No!! You don’t say!!! 🤦‍♂️ Sorry, this is the dumbest idea, ever. Some idiot is going to set that too low and wonder why websites and webapps stop working. Gamers just need to learn not to open a million tabs.