Paul Irish

@paul_irish

I 💗 the web • I work on performance, , and PageSpeed Insights. Lover of under-appreciated music. I like you, too.

Palo Alto
paul.irish
Joined March 2007
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  1. Pinned Tweet
    Jun 5

    Wow, huge thanks to all the credit card athletes. 😅 Summing up this whole thread, including company matches... Total calories burned: $46,550 Thanks friends for your help converting my fury into support for important causes. 🙏 Black Lives Matter.

    4 replies 4 retweets 65 likes
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  2. Retweeted
    Jul 31

    It's time to enable modern JavaScript npm libraries. This post by explains the current state and ways forward. I think the combined solution is compelling.

    comparison of output sizes for ES5 and ES2017 source.
    and
    28 replies 342 retweets 1,263 likes
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  3. Retweeted
    Jul 29

    I'm always using percents in CSS, but often have to stop and ask: "% of what?" hint: it's probably not what you think. hopefully this guide helps clear things up - there's a fun exercise at the bottom, too:

    56 replies 848 retweets 3,506 likes
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  4. Jul 30

    Cuzillion is a phenomenal web performance tool. Quickly construct web pages with various compositions for performance analysis. Thanks for giving it a rebirth.

    Ever curious about how a `defer` script, invoking an XHR, starting a longtask, then adding an LCP element will be treated by perf metrics? Then geez is today a great day for you! is back! 🎉 Huge thanks to for ensuring the legacy survives!
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    1 reply 3 retweets 18 likes
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  5. Retweeted
    Jul 28

    Incredibly inspiring work from the NY Times RnD division finding a native way to incorporate PG scans in an article - animation is controlled by scrolling. Feels really great,

    23 replies 461 retweets 1,754 likes
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  6. Retweeted
    Jul 27

    It's been a while, but I wrote a new blog post🥳 All about cross-origin resource sharing (and understanding those annoying CORS errors lol) 💪🏼 Hope it helps! Includes: ✨ Same-Origin Policy ✨ Understanding CORS ✨ Preflighted Requests

    24 replies 252 retweets 1,106 likes
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  7. Retweeted
    Jul 23

    Redaxios is an ~800b Axios stand-in built on Fetch. 0.3 just added support for the baseURL, responseType, params, paramsSerializer and withCredentials options, plus fetch mocking and FormData support.

    28 replies 228 retweets 1,113 likes
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  8. Retweeted
    Jul 15

    awesome-webpack-perf just got updated! ✨ Added a bunch of new webpack tools for web perf, including — esbuild-webpack-plugin — zero-runtime CSS-in-JS libs — and more analysis tools

    42 retweets 187 likes
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  9. Jul 14

    Really impressed with the technique in here to do rich analysis with your Google Analytics data. Calculate the median and various percentiles.

    Google has made huge strides in developing performance metrics that report a user's lived experience instead of software or network statistics. Here's how to get these metrics into Google Analytics and replace the outdated 'Page Speed' report:
    2 replies 5 retweets 45 likes
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  10. Retweeted
    Jul 13

    📝 I added Lighthouse Scores to my Site’s Footer and You Can Too (using Speedlify)

    37 requests • 144 KiB Lighthouse 99 100 100 100
    13 replies 40 retweets 264 likes
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  11. Retweeted
    Jul 6

    One <div> is fun but how about 50? As I was working on this it was turning into just a collection of single divs, so I went with it. 💀 CSS collector’s cabinet over on

    A cabinet with cubbies filled with curiosities and collectables like vintage cameras, an abacus, apothecary samples, and more.
    222 replies 760 retweets 3,741 likes
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  12. Retweeted
    Jul 6

    PSA: Please stop using Internet Explorer. It's NEVER going to get any better.

    16 replies 47 retweets 159 likes
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  13. Retweeted
    Jul 1

    Quick thread about a mapping trick the has adopted in the last few weeks that have dramatically improved their coronavirus maps. The maps are about different topics, but note one other key diff. between maps on left (April 3), middle (wikipedia) & right (NYT today) 1/

    28 replies 469 retweets 1,682 likes
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  14. Retweeted
    Jun 30

    🧰 🔬 60+ features tested in popular build tools ✅ Find the right one for your project 🔎 Simple test source shows best practises

    11 replies 128 retweets 527 likes
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  15. Retweeted
    Jun 25

    🚨 Announcing the new CrUX API! A fast, RESTful API for monitoring real-user experiences of websites and pages. Try it 👉 + Core Web Vitals + 75th percentiles + URL granularity + Segment by device + Completely free!

    10 replies 235 retweets 659 likes
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  16. Retweeted
    Jun 15

    I tested the how the 1000 most popular Chrome extension impact browser performance. Here are the results. Thread 1/N... ➡️

    10 replies 273 retweets 513 likes
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  17. Retweeted
    Jun 9

    ARREST THE COPS THAT MURDERED BREONNA TAYLOR. KEEP BEING LOUD ABOUT THIS. JUSTICE IS REQUIRED.

    173 replies 180,139 retweets 291,856 likes
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  18. Jun 4

    Wow, and an incognito donor just came in with $5k for the ACLU. Alright then. Ditto.

    1 reply 2 retweets 23 likes
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  19. Jun 4

    If you're not furious, you're not paying attention. The last 4 hours: Time to give my credit card a workout. 💳 Reply with screenshots of your donations today and I'll match till I hit my credit limit.

    This Tweet is unavailable.
    10 replies 10 retweets 40 likes
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  20. Retweeted
    Jun 2

    This is such a great question. Powerful and ever relevant. No one is standing!

    0:37
    Every single white person needs to watch this today.
    46 retweets 118 likes
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