Rigor

JULY 11, 2019

First Contentful Paint (FCP): Is It Happening? >1000 ms “slow” TTFB is due to the requirement for the fast FCP threshold of <1s. A server response that exceeds 1000ms cannot, by definition, meet the fast FCP goal and is thus considered slow. First Meaningful Paint (FMP): Is It Useful? Conclusion.

Ecommerce 87

Ecommerce Metrics Website Mobile 87

CSS Wizardry

MARCH 28, 2022

This, in effect, makes your FCP and LCP synonymous 1 2. For the purposes of this article, I built a series of reduced demos showing how each of the LCP types behave. is available for you to look through, though we’ll pick apart individual waterfalls later in the article. Avoid Image-Based LCPs. As simple as that. Block-level.

Virtualization 330

Virtualization Google Metrics Testing 330

Smashing Magazine

OCTOBER 9, 2023

This article is the first of a brief two-part series where we will look specifically at the media you are most likely to use: images, video, and audio. Prioritize images that are part of the First Contentful Paint (FCP). So, let’s solve the headaches you might encounter when working with media files in a Gatsby project.

Media 79

Media Network Processing Code 79

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. Most important are the assets that come before the FCP.

Google 90

Google Analytics Traffic Metrics 90

CSS - Tricks

NOVEMBER 1, 2019

First Contentful Paint (FCP) - measures the point at which text or graphics are first rendered to the screen. The FCP distribution for the 10th, 50th and 90th percentile values as reported on August 1, 2019. First Contentful Paint ( FCP ). FCP happens after 2.5 FCP mobile speed distribution (CrUX, July 2019).

Speed 46

Speed Mobile Metrics Scalability 46

MachMetrics

DECEMBER 27, 2019

The first metric that analyzed was First Contenful Paint (FCP). In the below image, ‘fast’ websites are those with a FCP consistently below 1 second. As we mentioned in our article Average Page Load Times for 2020 , mobile page speed is a huge deal going forward. To this end, we can also look at FCP by device.

Performance 52

Performance Speed Website Mobile 52

CSS - Tricks

JULY 27, 2021

I also learned from time that it’s ideal if the First Contentful Paint (FCP) contains the LCP. 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 See this article about CLS and WebPageTest. Can’t wait for size-adjust.

Cache 97

Cache Google Innovation Testing 97

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

Smashing Magazine

AUGUST 3, 2023

First Contentful Paint (FCP) This is the time it takes for the browser to render the first bit of content from the DOM. You need to beware of slow server response times, particularly render-blocking JavaScript or CSS, or slow network connections, all of which can negatively affect FCP.

Performance 74

Performance Cache Traffic Metrics 74

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

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

CSS Wizardry

JANUARY 10, 2023

This audit and, accordingly, this article, only deals with script injection using document.write() —not its usage in general. FCP is at 2.778s. FCP is at 2.797s. FCP is at 4.073s. As well as exhibiting unpredictable and buggy behaviour as keenly stressed in the MDN and Google articles , document.write() is slow.

Google 239

Google Network Performance Availability 239

Smashing Magazine

APRIL 19, 2021

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. Did FCP narrowly miss out on being a Core Web Vital, or maybe it just looks better balanced with four metrics? SpeedIndex (SI).

Google 140

Google Metrics Mobile Analytics 140

Smashing Magazine

MARCH 25, 2021

First Contentful Paint (FCP), Cumulative Layout Shift (CLS), Largest Contentful Paint (LCP). For more insight, see this Web.dev article. See the great tips in the article Optimizing Video For Size And Quality. For one-off conversions, you can try tools like Squoosh.app or avif.io. Serve the right size.

Media 117

Media Performance Mobile Latency 117

CSS - Tricks

JULY 25, 2019

This article is from my friend Ben who runs Calibre , a tool for monitoring the performance of websites. In this article, we uncover how PageSpeed calculates it’s critical speed score. First Contentful Paint ( FCP ). Related Articles. We use Calibre here on CSS-Tricks to keep an eye on things. Recommended! Speed Index.

Google 71

Google Engineering Speed Mobile 71

Speed Curve

MAY 29, 2022

Just as you would increase your sample rate for the segments, you should consider increasing the sample rate for metrics such as FCP, LCP and Total Blocking Time, which don't have broad browser support. This article goes into detail about how our RUM sampling works and explains the different ways you can implement it.

Traffic 52

Traffic Metrics Monitoring Performance 52

Speed Curve

FEBRUARY 25, 2024

How to improve Processing Time and Presentation Delay When it comes to reducing Processing Time and Presentation Delay , many articles focus on breaking up Long Tasks up or 'yielding to the main thread' with setTimeout , scheduler.yield or requestIdleCallback , etc. While that is one place to start, it's not the only approach.

Analytics 92

Analytics Processing Google Mobile 92

MachMetrics

JUNE 30, 2021

In this article, we will particularly look at the average page load time in 2021 and importance of web vitals. Metrics Good Need Improvement Poor FCP [0, 1800ms] (1800ms, 3000ms] over 3000ms FID [0, 100ms] (100ms, 300ms] over 300ms LCP [0, 2500ms] (2500ms, 4000ms] over 4000ms CLS [0, 0.1] (0.1, 0.25] over 0.25.

Cache 78

Cache Speed Google Website 78

Smashing Magazine

JANUARY 11, 2021

It’s worth noting that you will end up with better Core Web Vitals scores by following a general advice in this article.). How To Improve Core Web Vitals , a detailed guide by Simon Hearne on each of the metrics (including other Web Vitals, such as FCP, TTI, TBT), when they occur and how they are measured. considerations.

Performance 145

Performance Cache Media Metrics 145