Zero-JS Wasn't Enough: Edge Caching SSR HTML on Cloudflare Workers (opens in new tab)

ended with a confession: same build, two PageSpeed runs two hours apart, desktop Performance 99 and then 90. I blamed first-screen hydration and removed it, all of it, React included. Then I ran PageSpeed four times in ten minutes on the zero-JS build and watched the score land on 96, 100, 98, 96. The jitter had survived the framework's funeral. Whatever was moving the score was not running in the browser. Why a zero-JS first screen still can't stabilize your Core Web Vitals Removing React to...