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Performance Mistakes
…an HTTP Archive Deep Dive
Performance Architect @Etsy
Paul Calvano
@paulcalvano
https://httparchive.org
3
How the HTTP Archive Works
● httparchive.org
○ Monthly trends
○ Discussion forum
○ Web Almanac
Chrome UX Report
~8.5 million URLs
https://almanac.httparchive.org/
4
<img src="example.jpg" loading="lazy" />
5
https://web.dev/lazy-loading-images/
6
https://caniuse.com/loading-lazy-attr
Source: https://almanac.httparchive.org/en/2021/media#lazy-loading
8
https://web.dev/lcp-lazy-loading/
9
https://almanac.httparchive.org/en/2021/performance#fig-20
10
https://web.dev/lcp-lazy-loading/
11
Source: HTTP Archive, April 2022 - Mobile
315,940
Sites failed the
Lazy Loaded LCP audit
Examples
https://www.flipkart.com/
https://open.spotify.com/
https://ml.t-mobile.com/en/home
https://store.playstation.com/
https://www.nba.com/
12
https://almanac.httparchive.org/en/2021/resource-hints
13
https://almanac.httparchive.org/en/2021/resource-hints
14
dns–prefetch is used more often than preconnect.
If you are using dns-prefetch and the domain is used to load content on the same page,
use preconnect instead!
15
<link rel="preconnect" href="//i.etsystatic.com" />
Why does this look like a dns-prefetch instead of a preconnect?
16
https://w3c.github.io/resource-hints/
17
Source: HTTP Archive, April 2022
9.7 Million
Preconnect Headers
4.5 Million
Preconnects in HTML
101K
Missing crossorigin
2.8 Million
Missing crossorigin
These work fine.
¯_(ツ)_/¯
Many are blocked by CORS
Examples
https://www.etsy.com/
https://www.ikea.com/
https://nypost.com/
https://www.chess.com/
https://www.tiktok.com/
https://www.dell.com/
https://www.realtor.com/
18
19
https://web.dev/preload-critical-assets/
<link rel="preload" as="font" href="/assets/Pacifo-Bold.woff2">
20
430K
Sites’ with Unused Preloads
Examples
https://www.washingtonpost.com/
https://www.amazon.com/
https://www.redfin.com/
https://www.wayfair.com/
https://tinder.com/
https://weather.com/
https://www.dailymail.co.uk/
21
318
Unused Preloads
22
https://almanac.httparchive.org/en/2021/compression
23
https://almanac.httparchive.org/en/2021/compression
24
https://almanac.httparchive.org/en/2021/compression
25
http://nginx.org/en/docs/http/ngx_http_gzip_module.html
NGINX’s default gzip compression level is 1
If you use NGINX, check your compression levels.
If you make a change to your compression levels, you will also need to purge CDN
caches, because they cache the compressed content you served.
26
https://tools.paulcalvano.com/compression.php
/smart/buttons Test Expected % Diff
Uncompressed 373 KB 373 KB -
Gzip Compressed 130 KB 99 KB 31% larger
Brotli Compressed 152 KB 113 KB 35% larger
27
https://tools.paulcalvano.com/compression.php
28
226K
Sites’ with >5 first party
Images served compressed
Examples
https://www.costcotravel.com
https://www.cricketwireless.com
https://www.ryanair.com
https://www.basspro.com
https://support.apple.com
29
● Lazy Loading
○ Don’t lazy load above-the-fold images
○ Check Lighthouse audit for lazy loading LCP image
● Resource Hints
○ If using dns-prefetch for domains loaded on the same page, use preconnect
instead.
○ Are your Preconnects are actually being used? Check the crossorigin attributes
○ Check the console to ensure you don’t have unused preloads
● Compression
○ Using NGINX? Check your gzip compression levels
○ Test your largest resource - are compression levels within expected ranges?
○ Avoid compressing binary responses such as images.
HTTP Archive Web Almanac
31
Thanks!
bit.ly/ha-slack
Chat
github.com/HTTPArchive
Contribute
discuss.httparchive.org
Collaborate
@paulcalvano
paul@httparchive.org

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