Web Performance LessonsSolving performance challenges on other people’s websites

•E-commerce• Retail• Insurance• Automotive

•News and forums•Brochureware

Context

•Browser rendering performance•Delivering responses to the browser•Rendering responses on the server•Availability

Performance and Efficiency

WebGoat

•Cache-Control and Expires headers•Query strings•Protocol-relative URLs•Prefer GET instead of POST

Cache in the browser

•Scripts and Stylesheets• Concatenate•Minify/compress

• Images• Resolution (and in HTML)• Strip metadata• Sprite / Inline

Appropriate resources

•<script defer>•Page-load time versus quality metrics•Shared CDN versus on-domain•Beware coupling

Scripts

•Dynamic pages not found•Server-side session state•Database contention•Degrade gracefully

Web Server

•TLS is fast•Multiplexing•Server Push•Domain sharding

HTTPS and HTTP/2

•Cookies•Vary: User-Agent•Cross-Site Request Forgery•User-abstracted HTML

Content Delivery Network

Jason Stangroome

Twitter: @jstangroomehttps://blog.stangroome.com

Thank you

1-5 August

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