CSS Wizardry

JULY 23, 2023

For citations, quotes, proof, and evidence, read on… Site-Speed Is More Than SEO While this article is an objective look at the role of Core Web Vitals in SEO, I want to take one section to add my own thoughts to the mix. To this end, passing Core Web Vitals means Good LCP and CLS, and Good or Not enough data FID.

Engineering 246

Engineering Google Speed Mobile 246

CSS - Tricks

JULY 27, 2021

In the waterfall above (here’s a super detailed article on reading waterfalls from Matt Hobbs), you can see the HTML arrives in about 0.5 After re-testing with the change in place, you can see on a big article page the start render is a full 2 seconds faster on a 4G connection: That’s a biiiiiig change. > elements.

Cache 97

Cache Google Innovation Testing 97

CSS - Tricks

OCTOBER 26, 2020

Cumulative Layout Shift (CLS) is a tricky one. That’s the one where, say, the site has an advertisement at the top of an article. The request for that ad is asynchronous, so there is a good chance the ad comes in late and pushes the content of the article down. CLS isn’t just “does page do it or not?”

Cache 96

Cache Metrics Google Performance Testing 96

Smashing Magazine

MAY 12, 2022

Recently Noam Rosenthal published two articles analyzing the common benefits and capabilities provided by various frameworks , and also their associated costs. I highly recommend checking out these articles. For this article, I primarily rely on insights gained from analyzing data presented using the Core Web Vitals Technology Report.

Google 127

Google Performance Website Mobile 127

Speed Curve

APRIL 27, 2022

Anti-flicker snippets can also affect Cumulative Layout Shift (CLS) and the synthetic equivalent of First Input Delay (FID), Total Blocking Time (TBT). Lower Cumulative Layout Shift score – CLS measures how much content moves around on the page. On the other hand, they can appear to improve TBT and CLS.

Performance 145

Performance C++ Google Retail 145

CSS Wizardry

JUNE 7, 2023

This is an update to my 2020 article Site-Speed Topography. Visually, patterns do still emerge: the PD- and SR-Pages have more dense clusters of bars, suggesting overall worse health; the Home and Product pages have by far the worst LCP scores; the SRP’s CLS is through the roof. But this is only visual and not exactly persistent.

Speed 131

Speed Metrics Website Database 131

Smashing Magazine

JUNE 2, 2021

In this article, I’ll highlight some of the work we did and how we were able to achieve our speed. For this article, we will focus on the first three and the performance adjustments for these. And while you can usually cache the full page of an article, the same is not true of many shop pages and elements. Large preview ).

Performance 115

Performance Cache Website Mobile 115

Smashing Magazine

APRIL 19, 2021

Cumulative Layout Shift (CLS). I’m sure we’ve all clicked on an article, started reading, and then had the text jump around as images, advertisements, and other content is loaded. CLS attempts to account for these layout shifts. Bigger changes to how CLS is actually measured are also in progress. Lab Versus RUM.

Google 140

Google Metrics Mobile Analytics 140

Speed Curve

MARCH 7, 2022

You can dive deeper into image optimization and SEO tips in this article in Google Search Central.). Cumulative Layout Shift (CLS) measures how visually stable a page is. CLS is strongly affected by the number of resources on the page, and by how and when those resources are served. The CLS score for this page is 1.0468.

Mobile 145

Mobile Benchmarking Google Metrics 145

CSS - Tricks

MARCH 29, 2021

Ya know, the acronym soup: CLS , LCP , and FID. Like if you have crappy CLS , it’s because you load in stuff (probably ads) that shifts layout, and you should either stop doing that or make space for them ahead of time so there is less shifting. Direct Link to Article — Permalink.

Games 98

Games Metrics Google Strategy 98

Smashing Magazine

MAY 17, 2021

Google bins experiences into “Good”, “Needs Improvement”, and “Poor” based on the LCP, FID, and CLS scores real people have on the site: LCP , or Largest Contentful Paint, defines the time it takes for the largest content element to become visible. A summary of LCP, FID and CLS. Our CLS score still had the most room for improvement.

Google 93

Google Analytics Serverless Metrics 93

CSS - Tricks

JULY 1, 2021

This is particularly true for Cumulative Layout Shift (CLS) and Largest Contentful Paint (LCP). There are a bunch more practical ideas in the article and they’re all good ideas (because good performance is good for lots of reasons), even if the SEO angle isn’t compelling to you. Direct Link to Article — Permalink.

Engineering 97

Engineering Performance 97

CSS - Tricks

NOVEMBER 24, 2020

I’m not yet convinced that Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS) are the right metrics that all sites should be measuring themselves against. Direct Link to Article — Permalink. I mean, WTF?). The post The Core Web Vitals hype train appeared first on CSS-Tricks.

Analytics 73

Analytics Metrics Development Performance 73

Speed Curve

FEBRUARY 28, 2024

Support article: Trigger deployment tests On-demand site testing Here are some common use cases that may sound familiar to you: "I just deployed changes to my site and want to check for any regressions." CLS diagnostics Cumulative Layout Shift is broken down by each layout shift and displayed within session windows.

Testing 74

Testing Benchmarking Performance Testing Metrics 74

Smashing Magazine

MARCH 19, 2021

Ironically, at the moment of publishing that article in late February, we still had floating labels used in most of our forms, and we wanted to explore if removing them would actually help us improve the overall experience on the site. On February 19th, most of our articles landed in the red zone. Floating Labels Are Gone.

Mobile 140

Mobile Design Cache Code 140

Smashing Magazine

MAY 9, 2022

With that caveat out of the way, let’s get to the guts of the article: What is the Back/Forward Cache and why does it matter so much? Think about the number of times you visit a home page, click on an article, then go back to the home page to view another article? Big CLS improvement! Now close the tab. Even faster yeah?

Cache 91

Cache Games Performance Website 91

Speed Curve

JULY 26, 2022

Diagnose Cumulative Layout Shift (CLS) issues. Most-read support articles. These are the most popular articles users looked up in the past month: Understand medians, averages, and percentiles. Track Google's Core Web Vitals (and create performance budgets for them). Investigate why your Time to Interactive (TTI) is slow.

Testing 52

Testing Performance Metrics Traffic 52

Smashing Magazine

MARCH 7, 2022

In my last article , I suggested using the SaveData API to deliver a different, more performant, experience to users that expressed that desire. In this article, I want to spend a bit more time on this, and also look at other signals we can similarly use to help us make decisions on what to load on our websites. Barry Pollard.

Website 103

Website Media Mobile Network 103

Smashing Magazine

FEBRUARY 27, 2024

More than that, we can tell if any user interactions took place that would affect the CLS value, such as zooming, changing browser size, or actions like keydown , pointerdown , and mousedown. What elements often shift around on the page and cause high CLS? If there is slow INP, what page elements are these users interacting with?

Performance 95

Performance Metrics Monitoring Google 95

Smashing Magazine

APRIL 29, 2021

Imagine you’ve started reading an article when all of a sudden elements shift around the page, throwing you off and requiring you to find your place again. Cumulative Layout Shift (CLS, a Core Web Vitals metric) measures the instability of content. You may also be interested in the CLS Debugger. Large preview ). Large preview ).

Media 145

Media Network Metrics Mobile 145

Speed Curve

DECEMBER 20, 2021

Cumulative Layout Shift visuals – Because CLS is a score-based metric that's intended to let you know how janky a page is, it's tricky to understand what it means in terms of actual user experience. This video shows you how to use SpeedCurve to investigate CLS issues.). Performance Budgets 101. Performance Culture Best Practices.

Retail 52

Retail Benchmarking Metrics Website 52

MachMetrics

JUNE 30, 2021

In this article, we will particularly look at the average page load time in 2021 and importance of web vitals. Cumulative Layout Shift (CLS) : measures visual stability. To provide a good user experience, pages should maintain a CLS of 0.1. Factors that impact on CLS: loading ads without a designated room.

Cache 78

Cache Speed Google Website 78

Speed Curve

MAY 1, 2023

> Cumulative Layout Shift (Synthetic and RUM) Cumulative Layout Shift (CLS) is another one of Google's Core Web Vitals. CLS is a score that captures how often a user experiences unexpected layout shifts as the page loads. A poor CLS score could be a sign that page feels janky to your users.

Performance 98

Performance Metrics Media Google 98

Smashing Magazine

MARCH 25, 2021

First Contentful Paint (FCP), Cumulative Layout Shift (CLS), Largest Contentful Paint (LCP). Since the CWVs will also be a signal for Google to crawlers, it makes sense to monitor and optimize for those metrics : Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS). Serve the right format.

Media 117

Media Performance Mobile Latency 117

CSS - Tricks

SEPTEMBER 2, 2021

web-vitals-element — An npm packages from Stefan Judis that boots up a <web-vitals> web component showing your CLS, FID, LCP, and BVD ( demo ). A couple of kilobytes that might be lazy loaded/code-split out is not that big of a deal, especially since the frameworks might be optimized for runtime performance. More links! performance.

Performance 53

Performance Cache AWS Technology 53

CSS - Tricks

JULY 1, 2021

This is particularly true for Cumulative Layout Shift (CLS) and Largest Contentful Paint (LCP). There are a bunch more practical ideas in the article and they’re all good ideas (because good performance is good for lots of reasons), even if the SEO angle isn’t compelling to you.

Engineering 40

Engineering Performance 40

Speed Curve

SEPTEMBER 20, 2022

Cumulative Layout Shift (CLS) measures the visual stability of a page. When the consent banner is not shown, an article title becomes the LCP element. Largest Contentful Paint (LCP) measures when the largest visual element (image or video) finishes rendering. How much did the content move around as it loads?

Metrics 141

Metrics Retail Mobile Analytics 141

Smashing Magazine

MAY 25, 2021

Smashing Magazine, like most publishers, makes use of web fonts and the below screenshot shows the difference between the initial render (with the fallback fonts), and the final render (with the web fonts): Smashing Magazine article with fallback font and with full web fonts. Large preview ). Large preview ).

Operating System 143

Operating System Google Website Cache 143

Smashing Magazine

JANUARY 11, 2021

Getting Ready: Planning And Metrics Performance culture, Core Web Vitals, performance profiles, CrUX, Lighthouse, FID, TTI, CLS, devices. Cumulative Layout Shift ( CLS ) The metric highlights how often users experience unexpected layout shifts ( reflows ) when accessing the site. Cumulative Layout Shift ( CLS ) < 0.1.

Performance 145

Performance Cache Media Metrics 145

Smashing Magazine

AUGUST 3, 2023

Cumulative Layout Shift (CLS) Calculates the visual stability of a page. Image source: web.dev ) ( Large preview ) While optimizing for FID and CLS was relatively straightforward, LCP posed a greater challenge due to the multiple factors involved. Core Web Vital metrics definitions.

Performance 74

Performance Cache Traffic Metrics 74

Smashing Magazine

JANUARY 21, 2021

We were designing and building things, setting up new products, refactoring the components, and publishing articles. The entire site is built with progressive enhancement in mind, meaning that you, dear reader, can read every Smashing article in its entirety without the need to boot the application at all. We had to fix that.

Performance 145

Performance Cache Mobile Network 145

Smashing Magazine

OCTOBER 24, 2023

The Fight For The Main Thread The Fight For The Main Thread Geoff Graham 2023-10-24T18:00:00+00:00 2023-10-24T22:02:26+00:00 This article is sponsored by SpeedCurve Performance work is one of those things, as they say, that ought to happen in development. Hey, look at that — great job, team! Large preview ) I love this stuff!

Google 90

Google Analytics Traffic Metrics 90

Smashing Magazine

OCTOBER 6, 2021

Reviewing how to handle a lack of support for a feature is a bit beyond the scope of this article. Note : Please make sure to check the resources at the end of this article for a few links related to checking CSS specificity. If you’re unfamiliar, you may enjoy my article on practical uses of CSS functions. Large preview ).

Design 145

Design Availability Mobile Website 145

Speed Curve

JULY 3, 2023

Page bloat can have a huge impact on your Vitals: Cumulative Layout Shift – Excessive resources can contribute to a poorer CLS score, as more elements shift on the page. You can dive deeper into image optimization and SEO tips in this article in Google Search Central.) How does page bloat hurt your visitors?

Mobile 52

Mobile Google Metrics Retail 52

Smashing Magazine

JANUARY 6, 2020

Cumulative Layout Shift ( CLS ) The metric highlights how often users experience unexpected layout shifts ( reflows ) when accessing the site. From Addy’s article “ Loading Web Pages Fast On A $20 Feature Phone ”. No wonder, then, that a low TBT is a good indicator for good performance. thanks, Artem, Phil). Large preview ).

Performance 145

Performance Cache Network Metrics 145