Homepage Core Web Vitals Optimization only expert required for ( First Contentful Paint , Largest Contentful Paint)

I have a corporate website that is currently lagging behind on Google’s PageSpeed Insights. On mobile, the Largest Contentful Paint sits at 6.2 s, First Contentful Paint at 4.1 s, the Speed Index also at 4.1 s, and Total Blocking Time hovers around 270 ms (CLS is already fine at 0). I need those numbers brought comfortably into the green.

The biggest pain points seem to come from heavy-handed JavaScript and bulky style sheets, so your main task is to refactor, defer, compress, or otherwise tame the existing JS & CSS without breaking the site’s functionality or design consistency. I’m particularly concerned with the homepage, as that’s where most visitors land and where I see the sharpest drop-off.

You’re free to use any proven optimisation techniques—code splitting, async loading, tree-shaking, critical-CSS extraction, or smarter bundling in Webpack/Vite—so long as the end result is measurable. I’ll consider the job complete once the homepage scores noticeably better on PageSpeed, with LCP under 2.5 s and Total Blocking Time below 150 ms on standard mobile tests.

Please tell me how you plan to approach the script and style overhaul, any tools you typically rely on (e.g. Lighthouse CLI, Webpack plugins, PurgeCSS, etc.), and roughly how long you expect the improvements to take.