CSS Wizardry

NOVEMBER 3, 2020

my about page ), and article pages, like this one you’re reading right now; an ecommerce site would have a homepage, a product listings page (PLP), a product details page (PDP), and a search results page (SRP). However, and slightly more obscure, the high CLS on the SRP is not joined by a high LCP.

Speed 292

Speed Ecommerce Metrics Analytics 292

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

CSS - Tricks

JULY 27, 2021

Identified Problem #1) Poor LCP. Largest Contentful Paint (LCP) is one of the Core Web Vitals (CWV), which everyone is carefully watching right now with Google telling us it’s an SEO factor. My LCP was clocking in at 3.993s which isn’t great. Turn off lazy loading of LCP image. Let’s dig in!

Cache 97

Cache Google Innovation Testing 97

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

Smashing Magazine

AUGUST 3, 2023

These metrics provide a different perspective on user experience: Largest Contentful Paint (LCP) Measures the time it takes for the main content on a webpage to load. 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.

Performance 74

Performance Cache Traffic Metrics 74

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

CSS - Tricks

MARCH 29, 2021

Ya know, the acronym soup: CLS , LCP , and FID. But what about LCP ? What if you have this big hero image that is taking a while to paint and it’s giving you a crappy LCP number? Direct Link to Article — Permalink. So, I’m seeing some scrambling to make sure those metrics are good.

Games 98

Games Metrics Google Strategy 98

Speed Curve

MAY 1, 2023

The slowest LCP time is 8.64 Let's continue with the example above, where the worst LCP time was 8.64 At the same time, the person responsible for this page might know that they would like the LCP time to eventually be 2.5 LCP is the time at which the largest visible element in the viewport is rendered. Learn more here.)

Performance 98

Performance Metrics Media Google 98

Smashing Magazine

AUGUST 15, 2023

So noticeable, in fact, that Core Web Vitals has a metric all about it called Largest Contentful Paint (LCP). We can test for LCP in a number of ways. The following screenshot is taken from a test I ran through WebPageTest, resulting in an LCP of 2.4 WebPageTest waterfall timeline report. The image is completely covering it.

Media 73

Media Metrics Mobile Best Practices 73

Smashing Magazine

MAY 5, 2021

Here’s another article about reducing JavaScript dependencies and the bundle size sent to the client. This article is about a couple of things that Bookaway faced and we (as a company in the traveling industry) managed to optimize our pages, so that the HTML we send is smaller. The main goal is to have a small LCP as possible.

Google 110

Google Architecture Servers Speed 110

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

Smashing Magazine

APRIL 29, 2021

E.g. LCP measures when the largest contentful element (images, text) in a user’s viewport, such as one of these images, becomes visible. Largest Contentful Paint (LCP) is a Core Web Vitals metric that measures when the largest contentful element (images, text) in a user’s viewport, such as one of these images, becomes visible.

Media 145

Media Network Metrics Mobile 145

Smashing Magazine

APRIL 11, 2022

Loading experience is crucial to the user’s first impression and overall usability, so Google defined Largest Contentful Paint (LCP) metric to measure how quickly the main content loads and is displayed to the user. The main content for LCP is usually the largest element located above the fold. Large preview ). Large preview ).

Media 69

Media Tuning Metrics Google 69

Smashing Magazine

OCTOBER 18, 2021

There are many user-centric performance metrics to measure different points in a page’s life cycle such as FCP, LCP, FID, CLS, and so on. Barry Pollard has written an excellent in-depth article about CLS. Note : Paul Irish has written an excellent article on this topic. For this case study, we are mainly going to focus on CLS.

Website 105

Website Google Metrics Testing Tools 105

Speed Curve

APRIL 27, 2022

But this practice comes with some performance measurement pitfalls: Hiding the contents of the page can have a dramatic effect on the Web Vitals that measure visual experience, such as First Contentful Paint (FCP) and Largest Contentful Paint (LCP). If some of this movement happens while the page is hidden, then the CLS score will be lower.

Performance 145

Performance C++ Google Retail 145

Smashing Magazine

AUGUST 9, 2022

PageSpeed Compare measures vitals like FCP, LCP, FID, CLS, and others using land and field data. Alternatively, you can also check David Gossage’s article on How to review Core Web Vitals scores in bulk , in which he shares the scripts and how to get an API key to run the script manually without any external tools or services.

Performance 130

Performance Benchmarking Website Metrics 130

Speed Curve

FEBRUARY 5, 2024

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. That performance golden rule still holds true today. It's important to note that these are not considered public, so use at your own risk.

Servers 57

Servers Cache Retail Benchmarking 57

Smashing Magazine

APRIL 19, 2021

Largest Contentful Paint (LCP). LCP is relatively new, and we used to measure the similarly named First Contentful Paint (FCP) but LCP has been seen as a better metric for when the content the visitor likely wants to see is drawn. Largest Contentful Paint (LCP). The three Core Web Vitals metrics ( Large preview ).

Google 140

Google Metrics Mobile Analytics 140

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? so reusing them from that home page visit is a good saving.

Cache 91

Cache Games Performance Website 91

Smashing Magazine

OCTOBER 31, 2023

Answering Common Questions About Interpreting Page Speed Reports Answering Common Questions About Interpreting Page Speed Reports Geoff Graham 2023-10-31T16:00:00+00:00 2023-10-31T17:06:18+00:00 This article is sponsored by DebugBear Running a performance check on your site isn’t too terribly difficult. That’s what this article is about.

Speed 97

Speed Google Website Metrics 97

Smashing Magazine

JUNE 2, 2021

These shifts of content are very annoying, making you lose your place in an article you’ve started reading or, worse still, making you click on the wrong button! In this article, I’m going to discuss some front-end patterns to reduce CLS. How to optimize your LCP should be a relatively well-understood problem for most web pages.

Media 125

Media Metrics Website Google 125

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." Both the LCP and Last Painted Hero elements are highlighted. Read this article to learn more about deployments.

Testing 74

Testing Benchmarking Performance Testing Metrics 74

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

Speed Curve

NOVEMBER 1, 2022

For more information on interpreting histograms, see this support article. This example shows Largest Contentful Paint (LCP) from RUM for a page labeled 'Home' along with Image Size and the Lighthouse Performance score from a synthetic test with the same label: Correlate RUM data with synthetic diagnostics for Core Web Vitals.

Benchmarking 57

Benchmarking Best Practices Monitoring Traffic 57

Smashing Magazine

OCTOBER 2, 2023

In this second article, I’ll go over some key technical highlights from the project. In the first article, I briefly discussed the technical stack that includes a React-based front-end framework, Next.js Definitely read up on the strategy and reasoning behind this stack in the first article if you missed it.

Cache 72

Cache Strategy Best Practices Design 72

Speed Curve

NOVEMBER 27, 2023

FCP, LCP, Load, etc.) Things that can affect INP include: Long-running JavaScript event handlers Input delay due to Long Tasks blocking the main thread Poorly performing JavaScript frameworks Page complexity leading to presentation delay For some ideas around optimizing INP, I've included some great resources at the bottom of this article.

Google 110

Google Traffic Ecommerce Metrics 110

MachMetrics

JUNE 30, 2021

In this article, we will particularly look at the average page load time in 2021 and importance of web vitals. Largest Contentful Paint (LCP) : measures loading performance. To provide a good user experience, LCP should occur within 2.5 If your LCP is less than 2.5 seconds of when the page first starts loading.

Cache 78

Cache Speed Google Website 78

Speed Curve

MARCH 7, 2022

You can dive deeper into image optimization and SEO tips in this article in Google Search Central.). Largest Contentful Paint (LCP) measures when the largest visual element on the page renders. If your image starts to render at the 1-second mark but takes 4 seconds to fully render, then your LCP time is 5 seconds.

Mobile 145

Mobile Benchmarking Google Metrics 145

CSS - Tricks

APRIL 28, 2022

In my last article , we went over how to set up a web app that serves chunks and bundles of CSS and JavaScript from CloudFront. Note that this is substantially more work than what we saw in the last article, and the instructions are likely to be different for you based on the exact needs of your web app, so your mileage may vary.

Cache 79

Cache AWS Servers Traffic 79

Smashing Magazine

MAY 17, 2021

We have enabled Web Vitals which lets us see which element caused the LCP. 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.

Google 93

Google Analytics Serverless Metrics 93

Speed Curve

JULY 3, 2023

Largest Contentful Paint – LCP measures when the largest visual element (image or video) in the viewport finishes rendering. If you're serving huge videos that take several seconds to fully render, it could be hurting your LCP times. Heavier visual elements can take much longer to render, especially videos.

Mobile 52

Mobile Google Metrics Retail 52

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

Speed Curve

MAY 9, 2023

FCP, LCP, Load, etc.) Things that can affect INP include: Long-running JavaScript event handlers Input delay due to Long Tasks blocking the main thread Poorly performing JavaScript frameworks Page complexity leading to presentation delay For some ideas around optimizing INP, I've included some great resources at the bottom of this article.

Metrics 96

Metrics Google Mobile Analytics 96

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