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Measure What You Impact, Not What You Influence

CSS Wizardry

As I see it, there are two main issues when it comes to measuring performance changes (note, not improvements , but changes) in the lab: Site-speed is nondeterministic 1. I can reload the exact same page under the exact same network conditions over and over, and I can guarantee I will not get the exact same, say, DOMContentLoaded each time.

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In Defence of DOM­Content­Loaded

CSS Wizardry

Honestly, I started writing this article, for no real reason and somewhat without context, in December 2022—over half a year ago! Instead, we have: domContentLoadedEventStart : This is the one we’re interested in, and is equivalent to the concept we’ve been discussing in this article so far. log ( window. performance. performance.

Metrics 326
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New Network Fallacies

Tim Kadlec

I remember reading articles about how 3G connectivity was going to transform performance and, more generally, the way we used the internet altogether. ” The fallacy of networks, or new devices for that matter, fixing our performance woes is old and repetitive. In theory, the maximum downlink speed is 100 Mbps.

Network 61
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How to use Server Timing to get backend transparency from your CDN

Speed Curve

Looking at the industry benchmarks for US retailers , four well-known sites have backend times that are approaching – or well beyond – that threshold. Pagespeed Benchmarks - US Retail - LCP When you examine a waterfall, it's pretty obvious that TTFB is the long pole in the tent, pushing out render times for the page.

Servers 57
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Optimizing Video For Size And Quality

Smashing Magazine

A video with large dimensions or a high bitrate will take longer to download and will require a higher speed network to play back smoothly. This leads to longer startup times, and if the network cannot supply the video fast enough, the video will stall during video playback. Bitrate is the playback speed of the video.

Network 143
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Introducing Page Speed Benchmarks – a new resource for the performance community

Speed Curve

What are some good sites I can use for benchmarking? Page Speed Benchmarks is an interactive dashboard that lets you explore and compare web performance data for leading websites across several industries – from retail to media. Identify sites you can use for your own competitive benchmarking.

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Web Performance Bookshelf

Rigor

Reading time 1 min Why share the library of the web performance books while there’s a substantial collection of fantastic websites and articles on the net? High Performance Browser Networking. Fail, and you can kiss your customers and profits goodbye.” ” – Andy King, 2003. Time is Money. Javascript Good Parts.