PerfLens

by Sharaj · sharaj.pages.dev · Developer Tools

Established publisherManifest V3 Free

View in Chrome Web Store Data as of 15 Oct 2026

Real-session performance observer. Reads page timing locally.

Users

−1 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#369K

#277K among extensions

Version

2.2

updated 11 Aug 2026

Users

monthly, 3 months

Latest, 15 Oct 2026: 2 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 months

Latest, 15 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About PerfLens

PerfLens watches the pages you actually browse and tells you how they perform — no synthetic run, no lab throttling, no account. - Reads real user timing from the live session: Core Web Vitals, long tasks, layout shifts, and resource weight. - A DevTools panel for the detail and a popup for the score at a glance. - Explains every finding in plain language, and shows exactly how the score was computed. - Detects the framework and build setup of the page so the advice fits the stack.