One of the teams I've been working with to climb the performance management maturity ladder is...Edge!?!
We build a *lot* of the browser out of web "stuff" these days (think bookmarks, history, downloads, settings, new-tab-page, etc.), and moving away from React to a modern Web Components + HTML-first architecture has had a *huge* benefit for users, particularly folks on low-end hardware:
https://blogs.windows.com/msedgedev/2024/05/28/an-even-faster-microsoft-edge/