Lighthouse is great. I use it, and I still think it is one of the most useful performance tools available to web developers.

But I wanted something closer to the way I actually debug and ship web products, so I built PerfLens .

PerfLens is a browser-first performance auditing extension that gives you live Core Web Vitals, Lighthouse-style scoring, resource diagnostics, root cause summaries, performance history, and launch evidence directly inside your browser workflow.

Install it here: https://chromewebstore.google.com/detail/perflens/gkogamlpcnneeficmcdcnnnhobnbebdc

Why I Built It

A Lighthouse report is a strong snapshot, but performance work rarely ends with one snapshot.

During real development, I usually want to know:

What is slowing this page down right now?

Which resources are heavy?

Are my Core Web Vitals healthy?

What should I fix first?

PerfLens is built for that loop.

What It Includes

PerfLens currently supports:

Core Web Vitals: LCP, FID, CLS, INP, FCP, and TTFB.

0-100 performance…