@____lighthouse

Lighthouse analyzes web apps & sites, collecting modern performance metrics and insights on best practices. 📊 And yes, that's 4 underscores, my friends!

 Github, your browser, your CLI
developers.google.com/web/tools/lighthouse/
Joined February 2017
  • Tweets83
  • Following21
  • Followers14.4K
25Media
Lighthouse v11.2 includes an overhaul to the performance category that focuses audit prioritization on estimated impact to the performance metrics. Also included is an upgraded score gauge. On hover, it visualizes how each performance metric affects the overall performance score.
A Lighthouse report, with the score gauge at the top subdivided into multiple arcs, each corresponding to one of the performance metrics.

ALT A Lighthouse report, with the score gauge at the top subdivided into multiple arcs, each corresponding to one of the performance metrics.

6
87
4
356
41,813
Never knew @____lighthouse had fireworks when you got your page to 100% #webdevelopment #website
1
6
29
3,387
Didja know Lighthouse has a diff tool? 🤔 Compare two reports and see all the changes. googlechrome.github.io/light…
Landing of the Lighthouse Report Diff Tool. The UI has options drag-n-drop or select-from-disk two JSON or HTML reports. Or view an example.

ALT Landing of the Lighthouse Report Diff Tool. The UI has options drag-n-drop or select-from-disk two JSON or HTML reports. Or view an example.

Primary diff view. Shows how the top-level scores have improved/regressed. And perf metrics. And summaries for each audit.

ALT Primary diff view. Shows how the top-level scores have improved/regressed. And perf metrics. And summaries for each audit.

Detail diff view on "First Contentful Paint", "Serve images in next-gen formats" and "Eliminate render-blocking resources" differences in timing, observed transfer size and potential savings are called out.

ALT Detail diff view on "First Contentful Paint", "Serve images in next-gen formats" and "Eliminate render-blocking resources" differences in timing, observed transfer size and potential savings are called out.

Detail diff view of "Enable text compression" and "User Timing marks and measures". In user timing, you can see how the start time and duration of marks/measures have changed between the two.

ALT Detail diff view of "Enable text compression" and "User Timing marks and measures". In user timing, you can see how the start time and duration of marks/measures have changed between the two.

69
6
190
33,823
In Lighthouse 10.1, we've upgraded reporting of third parties and their impact: ➡️Audit tables are now grouped by party ➡️Detected third parties are tagged with their category (and linked!), so it’s easier to identify their purpose
A table from a Lighthouse report with listed script URLs grouped and labeled by third parties, like "Google Tag Manager" and "Google Analytics" in this example.

ALT A table from a Lighthouse report with listed script URLs grouped and labeled by third parties, like "Google Tag Manager" and "Google Analytics" in this example.

4
21
82
17,068
➡️The Lighthouse JSON now also includes a top-level `entities` object with data on all detected first and third parties.
An example of the Lighthouse results JSON, with an "entities" section expanded to show details like resources loaded from a particular entity (Google Fonts in this example), the entity's category and homepage, and any origins associated with the entity.

ALT An example of the Lighthouse results JSON, with an "entities" section expanded to show details like resources loaded from a particular entity (Google Fonts in this example), the entity's category and homepage, and any origins associated with the entity.

1
2
12
2,263
Lighthouse 10.0 is here!💡🚢 ➡️updated scoring (we'll kind of miss you TTI) ➡️bfcache ➡️complete type declarations ➡️read more: developer.chrome.com/blog/li…
13
148
24
577
135,120
PageSpeed Insights has expanded! The lab section now includes the entire Lighthouse report: + Accessibility + Best Practices + SEO Try it now: pagespeed.web.dev
3
57
5
234
Have you try out the new audit modes in @____lighthouse @ChromeDevTools yet? Use the Timespan mode to identify layout shifts and JavaScript execution time over a time range including interactions. Learn about the Snapshot mode and more 👉🏼 developer.chrome.com/blog/ne…
2
13
1
66
Now that the May HTTP Archive dataset is out with some URL-level data in the mobile pages table, I thought it would be a good time to repeat some internal analysis I did on the public dataset: colab.research.google.com/dr…

HTTP_Archive_TBT_and_INP.ipynb

Colaboratory notebook

colab.research.google.com
3
9
3
30
There have been a LOT of recent developments in the world of web performance and Core Web Vitals that are being showcased at Google I/O this week. Here's a rundown of the highlights, so you don't miss anything 👇
7
105
4
416
Poll📊: Have you used the new Lighthouse for User Flows? (aka Lighthouse analysis of puppeteer-scripted scenarios) web.dev/lighthouse-user-flow…
50%No, but I'm interested!
29%Nope
17%Yeah, I tried it out
4%Yes, been using regularly
102 votes • Final results
4
9
Lighthouse CI has been updated to Lighthouse 9.3.0! Great for continuous perf monitoring. Changelog: goo.gle/lhci9 Learn how to use LHCI: web.dev/lighthouse-ci
12
2
46
Lighthouse 9.0 is here! 💡🔅🔆⛵ Look for user flow support, a refreshed report, and more helpful accessibility audits. Try it through npm, Chrome Canary, or the new PageSpeed Insights! developer.chrome.com/blog/li…
The refreshed Lighthouse 9.0 report, with an embedded screenshot of the page being tested and more prominent display of the performance metrics.

ALT The refreshed Lighthouse 9.0 report, with an embedded screenshot of the page being tested and more prominent display of the performance metrics.

1
89
9
237
Introducing the new PageSpeed Insights: a more intuitive way to measure performance & improve it using real-world and lab data. Details: bit.ly/new-psi Try it: pagespeed.web.dev

The new PageSpeed Insights

We made the UI more intuitive by clearly differentiating between data derived from a synthetic environment + data collected in the field. We also clearly communicate how the CWV is calculated.

19
240
31
793
Introducing Lighthouse for user flows: drive your page with a Puppeteer script and have Lighthouse measure and audit performance at every step: web.dev/lighthouse-user-flow…
A Lighthouse user-flow report listing multiple steps of interacting with a page and Lighthouse audit results at each step

ALT A Lighthouse user-flow report listing multiple steps of interacting with a page and Lighthouse audit results at each step

12
388
41
1,637
💡What's new in Lighthouse 8.4!💡 New audits to check that: 🖼️ LCP images aren't lazy-loaded 📲 A mobile meta viewport is used (don't wreck your FID!) developer.chrome.com/blog/li…

What's new in Lighthouse 8.4  |  Blog  |  Chrome for Developers

Lighthouse 8.4 now guards against lazily-loading LCP images and failing FID without a mobile viewport.

developer.chrome.com
3
23
2
80
We're trying this out as a more in-depth companion to the usual changelog (github.com/GoogleChrome/ligh…). Let us know what you'd like to see in these posts in the future!
1
7
Lighthouse now considers the (sometimes significant) improvements that AVIF image compression can bring when advising on improving image load time! Look for the estimates under "next-gen formats" in the Lighthouse report 🤏🖼️⚖️
An example Lighthouse report showing potential load-time savings from reencoding images using a next-gen format like AVIF

ALT An example Lighthouse report showing potential load-time savings from reencoding images using a next-gen format like AVIF

1
26
1
68
It's a smaller aspect of the Lighthouse 8 release, but we've been shrinking dependency install size. Features moving into Node core has been key, like full-icu builds by default. Thanks @nodejs :) If you run Lighthouse in a container somewhere, this should help slim things down
A graph of Lighthouse install size over time, showing a recent trend from 65 MiB for 7.3 to 24 MiB in 8.0

ALT A graph of Lighthouse install size over time, showing a recent trend from 65 MiB for 7.3 to 24 MiB in 8.0

1
1
27
Load more