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Genuinely interested, why do you think Edge was faster than Chrome? What technical reason would be behind that?

I cannot imagine Microsoft improved Chrome's speed by a noticeable degree without Google noticing and applying the same improvements.

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Microsoft has made some Windows-based optimizations to things like memory management. But, as far as I know, they've been upstreaming those optimizations back to the Chromium codebase. There are some things that aren't upstreamed like Startup Boost and Game Mode (or whatever they're called) where Edge runs as a minimal background process on login to reduce startup lag when first opening Edge or reduces resource usage when Windows detects that you're playing a game, respectively.

Edge is using some new APIs of task management introduced in Windows 11.

The tl;dr is: It can now suspend tabs without killing the tabs.

I literally can run like 50 tabs on a 4gb RAM device with no problem on Edge. And no need to reload any tabs.

These tabs stay as "Efficiency mode".

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