In many projects, we minify CSS files, but the real issue that affects critical rendering time is usually when CSS is loaded.
Especially in large e-commerce projects, the following approach can make a serious difference in above-the-fold performance:
✅ Load critical CSS inline
✅ Load the remaining CSS in a non-blocking way
<link
rel="preload"
href="/styles/main.css"
as="style"
onload="this.onload=null;this.rel='stylesheet'"
>With this method, the browser starts downloading the CSS file early, but it does not block the rendering process.
In real user experience, even gains of a few hundred milliseconds can affect conversion rates.
On the frontend, sometimes the biggest improvements are not about adding new features, but about making the existing experience faster.