Discover and read the best of Twitter Threads about #perfnow
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Been looking forward to seeing this again!
Here's what happened when I added fetchpriority="high" to our homepage LCP image, a 0.6s improvement (iPhone 6+ / 4G). Gotta be the most literal one-line takeaway I've ever had from a conference talk, thanks @csswizardry!
#perfnow
Here's what happened when I added fetchpriority="high" to our homepage LCP image, a 0.6s improvement (iPhone 6+ / 4G). Gotta be the most literal one-line takeaway I've ever had from a conference talk, thanks @csswizardry!
#perfnow
@csswizardry A few more details. The homepage 'hero' image went from 15th request to 4th. It no longer has an initial low priority, and the request starts immediately after discovery rather than being queued. Requesting early also reduced CLS due to a layout reflow as the image renders.
Side note, the CLS issue began after we added a promotion to the homepage. The data was there, but I didn't spot it - performance budget now in place so I don't miss it again! If only I'd listened to @tameverts and setup budgets after I got back from Amsterdam.
#perfnow @anniesullie giving a fascinating talk on good metrics and how to use them
Shout out to @ChromeUXReport
Shout out to @ChromeUXReport
#perfnow Q: how would you evaluate Cumulative Layout Shift as a metric? How might we improve layout stability metrics?
Moar @HTTPArchive data!
#perfnow per @simonhearne and @HTTPArchive the median website is comprised of 37% third party requests
Based on Almanac queries almanac.httparchive.org/en/2019/third-…
Based on Almanac queries almanac.httparchive.org/en/2019/third-…
Uh this is amazingly awful. Nefarious cryptominers avoid detection from @HTTPArchive by self-deactivating on HA-like clients.
The median mobile site is bigger than the code that landed Apollo 11 on the moon! 😱 @tkadlec at #perfnow
h/t to @tameverts and @katiehempenius who wrote the Page Weight chapter of the Almanac almanac.httparchive.org/en/2019/page-w…
h/t to @tameverts and @katiehempenius who wrote the Page Weight chapter of the Almanac almanac.httparchive.org/en/2019/page-w…
Pretty good idea to check Amazon best sellers to get a pulse on popular consumer phones for performance testing
The hidden side to node module dependencies. Nobody writes 1 MB of JS themselves, they include them from third parties and JS deps.
Not saying people should reinvent every wheel, but do you really need a library for *that*?
Not saying people should reinvent every wheel, but do you really need a library for *that*?
#perfnow @shortdiv masterfully and seamlessly transitions from fast food condiments to predictive fetching. And now I'm hungry. For knowledge. And fries.
Also, we've got an Almanac chapter for that.
The state of Resource Hints by @katiehempenius
almanac.httparchive.org/en/2019/resour…
The state of Resource Hints by @katiehempenius
almanac.httparchive.org/en/2019/resour…
#perfnow What and how you pre-* can have a big positive (or negative!) effect on performance and UX
How to test for H2 prioritization issues with @usingwpt
Patrick Meenan and the Waterfalls of Doom #perfmatters
@csswizardry weaving a great story about the social explanations of performance issues
Unless we dig deep into our analytics, anomalies are unexplained blips. But with some curiosity there could be a big opportunity to unlock an entirely new market.
Unless we dig deep into our analytics, anomalies are unexplained blips. But with some curiosity there could be a big opportunity to unlock an entirely new market.
A comparison of real world performance by @mcmillanstu using Akamai's @ChromeUXReport benchmarking tool #perfnow
developer.akamai.com/akamai-mpulse/…
developer.akamai.com/akamai-mpulse/…
Wow.
👀 75th percentile mobile FCP for the Schuh website is only 900ms according to @ChromeUXReport data in PSI. Some serious WPO work to get there! #perfnow
developers.google.com/speed/pagespee…
developers.google.com/speed/pagespee…
Flash/Flex/applets were "flings" of the web
Didn't realize wasm files can have their compiled state cached and reused. I think that's also a benefit of cached JS via service workers.
Nod to @lara_hogan for giving us the phrase "performance culture"
