David Jacobs at Axos Bank uses Request Metrics to make their websites fast and usable.

"The engineering team behind this make Request Metrics an incredible value. I cannot recommend enough."

🔀 The powerful but dangerous Vary header:

Vary: Accept-Encoding

This creates separate cache entries for gzipped vs uncompressed content. But be careful - Vary on dynamic headers can destroy cache effectiveness 💣

requestmetrics.com/web-performance/http-caching/

🔄 "no-cache" ≠ "don't cache"!

This actually means "cache but validate before using" - not "don't cache at all" (that's no-store). This confusion causes so many performance issues! 🤦‍♂️

requestmetrics.com/web-performance/http-caching/

@joshuaclareflagg.bsky.social uses Request Metrics for his #ecommerce stores to give him Quick and Easy insights into his #CoreWebVitals, and how to make his website faster!

Lab Scores only represent
🧑‍💻a single load
🌎 from a single location
⏰ and a single point in time.

Generally, the score doesn't matter-- user experience matters. And you measure that with RUM and CrUX.

So why should you trust the numbers from Request Metrics? Because we SHOW OUR WORK!

🏷️ ETag: the unsung hero of HTTP caching

ETag: "123abc987654"

This simple fingerprint header tells browsers when content hasn't changed, enabling 304 responses that send zero data but keep content fresh 🧠

requestmetrics.com/web-performance/http-caching/

📄 Perfect caching for HTML documents:

Cache-Control: public, max-age=300, must-revalidate

Short cache time means content updates quickly, while "must-revalidate" ensures browsers double-check before showing potentially stale content 🔄

requestmetrics.com/web-performance/http-caching/

🚀 The optimal way to cache your static assets:

This tells browsers "don't even check if this file has changed" - cutting unnecessary validation requests and dramatically improving load times 💨

requestmetrics.com/web-performance/http-caching/

Responsive Images: Right Size, Right Device 📱

Stop serving massive images to small screens! Use srcset to send the right size image based on device width.

Less bandwidth = faster load times.

Learn how: https://requestmetrics.com/web-performance/high-performance-images/

#WebDev #Performance

Do you ❤️ Request Metrics?

We need your help! We just listed on @slashdot.org and our reviews look sad 😢

Give us a hand and let us know what you think by sharing a review!
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Picking the wrong photo format kills performance! JPG for photos, PNG for graphics, WebP/AVIF for modern compression.

Choosing wisely cuts file sizes in half!

Full breakdown: https://requestmetrics.com/web-performance/high-performance-images/

#WebPerf #CoreWebVitals

🗓️ TODAY at 5:00 UTC

Our founder @toddhgardner shares his investigation into whether #webperf actually matters for #SEO in 2025.

Join the free online meetup at https://performanceobserver.dev/

The new Lab Scan email is 🔥

We automatically scan your busiest pages, rollup your scores and common issues from Mobile and Desktop, and show details from your slowest pages.

Why are you still manually scanning your website?

Picking the wrong image format kills performance! JPG for photos, PNG for graphics, WebP/AVIF for modern compression.

Choosing wisely cuts file sizes in half!

Full breakdown: https://requestmetrics.com/web-performance/high-performance-images/

#WebPerf #CoreWebVitals

Vector images (SVG) scale infinitely, stay crisp at any size, and have tiny file sizes—perfect for icons, logos, and graphics.

Ditch PNGs when you can! Just don’t export a PNG as SVG—that’s cheating. 😉

Full breakdown here: 👉 https://requestmetrics.com/web-performance/high-performance-images/

🎉 We just dropped an updated version of our popular HTTP Cache Header Checking tool for Request Metrics.

It's a handy little tool to see how your website, image, scripts, or anything else on the web would be cached by web browsers. Caching can give you huge boosts for your returning visitors.

Have you seen the Keyword Vitals Chrome Extension?

It shows you the live performance scores in your Google Search pages and tells you if #webperf is a factor for that keyword.

It shows if you need better performance to rank for your target #seo keywords.

requestmetrics.com/resources/to...