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

Speed Curve

Google recommends that TTFB be 800ms at the 75th percentile. Looking at the industry benchmarks for US retailers , four well-known sites have backend times that are approaching – or well beyond – that threshold. Latency – How much time does it take to deliver a packet from A to B. Definitely worth a read!

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Fixing a slow site iteratively

CSS - Tricks

Google’s industry benchmarks from 2018 also provide a striking breakdown of how each second of loading affects bounce rates. Source: Google /SOASTA Research, 2018. Speed is also something Google considers when ranking your website placement on mobile. billion if the site slowed down by just one second. Lighthouse.

Cache 92
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A Complete Guide to Performance Budgets

Speed Curve

seconds or less, which is Google's recommendation for page experience and SEO. > Largest Contentful Paint (Synthetic and RUM) Largest Contentful Paint (LCP) is one of Google's Core Web Vitals. > Cumulative Layout Shift (Synthetic and RUM) Cumulative Layout Shift (CLS) is another one of Google's Core Web Vitals.

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The Performance Inequality Gap, 2024

Alex Russell

decoding="async" loading="lazy" /> Google spent more on the SoC for the Pixel 4a and enjoyed a later launch date, boosting performance relative to the A51. Pixels have never sold well, and Google's focus on strong SoC performance per dollar was sadly not replicated across the Android ecosystem, forcing us to use the A51 as our stand-in.

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The Performance Inequality Gap, 2021

Alex Russell

Using a global ASP as a benchmark can further mislead thanks to the distorting effect of ultra-high-end prices rising while shipment volumes stagnate. Sadly, data on latency is harder to get, even from Google's perch, so progress there is somewhat more difficult to judge. Today, either method returns a similar answer.

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Can You Afford It?: Real-world Web Performance Budgets

Alex Russell

Budgets are scaled to a benchmark network & device. Deciding what benchmark to use for a performance budget is crucial. Our metrics at Google show a conflicted picture (which I’m working to get to clarity on). Simulated packet loss and variable latency, however, can make benchmarking extremely difficult and slow.

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Front-End Performance Checklist 2021

Smashing Magazine

Assets Optimizations Brotli, AVIF, WebP, responsive images, AV1, adaptive media loding, video compression, web fonts, Google fonts. Run performance experiments and measure outcomes — both on mobile and on desktop (for example, with Google Analytics ). Adjust the argument depending on the group of stakeholders you are speaking to.