Performance optimization is a cyclical process. We are constantly learning new ways to optimize, while simultaneously adopting new technologies and techniques that negatively impact performance. The HTTP Archive provides a great historical record of the technical side of the web, with almost 10 years of history and an ever growing dataset of sites.
During this session Paul will provide a brief overview of the HTTP Archive and then dive into some insights into the adoption of common web performance techniques and some of their measurable impacts.
V65+ Edge v18+
1% of Chrome
45% of Chrome
Responsive Images served by 65% of sites.
Image Source: https://en.wikaipedia.org/wiki/File:Responsive_design_-_Commons_Android_app.jpg
● Performs DNS Lookup in advance of an HTTP request
● Implemented in HTTP Response Header: 1,775 websites
● Implemented in HTML Body: 1,620,685 websites
<link rel="dns-prefetch" href="..." />
● DNS + TCP + TLS in advance of an HTTP request
● Implemented in HTTP Response Header: 2,938,935 websites
● Implemented in HTML Body: 343,528 websites
<link rel="preconnect" href="..." />
Are Domain Sharding & Cookieless Domains Necessary?
Cacheabilty based on Cache-Control Header - HTTP Archive, Mobile, August 2019
How Cacheable is Web Content?