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Vanadium makes improvements on Chromium. https://grapheneos.org/features#vanadium

Most of those are just changing flags, not really unique development. Like "disable JIT" is a Chromium flag. "Zero-init everything" is a Clang flag.

It's not even a build flag, it's a setting that you can just go and enable in Chrome's own settings menu (chrome://settings/content/v8).

Right, but it's value-add on a derivative, not its own standalone engine.