Remove Definition Remove Latency Remove Metrics Remove Performance
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Towards a Unified Theory of Web Performance

Alex Russell

It's being reposted here for completeness, but if you care about web performance, make sure to check out the whole series and get subscribed to the RSS feed to avoid missing any of next year's posts. The predominant answer: a unified theory of web performance. What, in particular, is "web performance"? How do we do it?

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Mobile INP performance: The elephant in the room

Speed Curve

Earlier this year, when Google announced that Interaction to Next Paint (INP) will replace First Input Delay (FID) as the responsiveness metric in Core Web Vitals in *gulp* March of 2024, we had a lot to say about it. TLDR: FID doesn't correlate with real user behavior, so we don't endorse it as a meaningful metric.) for mobile.

Mobile 54
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Hello INP! Here's everything you need to know about the newest Core Web Vital

Speed Curve

After years of development and testing, Google has added Interaction to Next Paint (INP) to its trifecta of Core Web Vitals – the performance metrics that are a key ingredient in its search ranking algorithm. INP replaces First Input Delay (FID) as the Vitals responsiveness metric. This is what the INP metric assesses."

Mobile 81
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What are SLOs? How service-level objectives work with SLIs to deliver on SLAs

Dynatrace

SLOs, together with service-level indicators (SLIs), deliver the performance promised in service-level agreements (SLAs) and other business level objectives (BLOs) while staying within error budgets. To get a better handle on this, let’s start with some definitions. But what are SLOs? What are SLAs, SLOs, SLIs, and error budgets?

Metrics 186
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The Fastest Google Fonts

CSS Wizardry

With more standardised FOUT/FOIT behaviour from browser vendors, to the newer font-display specification, performance—and therefore the user—seems to have been finally been put front-and-centre. On this site, in which performance is the only name of the game, I forgo web fonts entirely, opting instead to make use of the visitor’s system font.

Google 363
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How to use Server Timing to get backend transparency from your CDN

Speed Curve

That performance golden rule still holds true today. However, that pesky 20% on the back end can have a big impact on downstream metrics like First Contentful Paint (FCP), Largest Contentful Paint (LCP), and any other 'loading' metric you can think of. 80% of end-user response time is spent on the front end.

Servers 57
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150 successful machine learning models: 6 lessons learned at Booking.com

The Morning Paper

Model performance is not the same as business performance. Prediction serving latency matters. Lesson 2: model performance is not the same as business performance. Booking.com estimate the value delivered by a model through randomized controlled trials which measure the impact on business metrics.

Latency 102