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Web Performance

All things speed and scalability on the web.

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Lazy loading a product grid: which images should never get loading="lazy"

Lazy loading a product grid: which images should never get loading="lazy"

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4 min read
First paint takes 368ms at my desk and 9.2 seconds on a slow link, and 3.7 of those seconds are our own font preloads

First paint takes 368ms at my desk and 9.2 seconds on a slow link, and 3.7 of those seconds are our own font preloads

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6 min read
Shopify Speed Fixes That Lift Conversion Rate Before You Touch Ads

Shopify Speed Fixes That Lift Conversion Rate Before You Touch Ads

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5 min read
Debugging a Slow PrestaShop Store: Find the Bottleneck Before You Optimize

Debugging a Slow PrestaShop Store: Find the Bottleneck Before You Optimize

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8 min read
Nginx vs Apache: What Is Best for TTFB?

Nginx vs Apache: What Is Best for TTFB?

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9 min read
HTTP/2 and HTTP/3 for Web Performance: What Changes for PageSpeed Monitoring

HTTP/2 and HTTP/3 for Web Performance: What Changes for PageSpeed Monitoring

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8 min read
Can CSS Affect Website Performance? A Beginner-Friendly Guide to Writing Efficient CSS

Can CSS Affect Website Performance? A Beginner-Friendly Guide to Writing Efficient CSS

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11 min read
Reproducing Lighthouse's image audits on one page, in Node

Reproducing Lighthouse's image audits on one page, in Node

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5 min read
Which Shopify Apps Slow Down Your Store? I Measured 396 Product Pages

Which Shopify Apps Slow Down Your Store? I Measured 396 Product Pages

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7 min read
Stop YouTube embeds slowing your Shopify homepage: a click-to-load video section

Stop YouTube embeds slowing your Shopify homepage: a click-to-load video section

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4 min read
Audit Core Web Vitals for a whole sitemap in one run (and get alerted when pages fail)

Audit Core Web Vitals for a whole sitemap in one run (and get alerted when pages fail)

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4 min read
Do Core Web Vitals Affect Rankings? What the Evidence Shows

Do Core Web Vitals Affect Rankings? What the Evidence Shows

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9 min read
Should you proxy through Server Actions or call APIs directly?

Should you proxy through Server Actions or call APIs directly?

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9 min read
PageSpeed 100 on Mobile With Next.js: What Actually Worked (and What Didn't)

PageSpeed 100 on Mobile With Next.js: What Actually Worked (and What Didn't)

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10 min read
Website Management: A Practical Checklist for Performance, Security, and Maintenance

Website Management: A Practical Checklist for Performance, Security, and Maintenance

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2 min read
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