HTTP/2 is coming! Unbundle all the things?!?

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HTTP/2 is coming! Unbundle all the things? main.js

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HTTP/2 is coming! Unbundle all the things? main.js

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HTTP/2 is here! Unbundle all the things? main.js

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Jumping to conclusions

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TCP Three Way Handshake Server Client SYN (got something) SYN+ACK (waddya want) ACK + Data image-1.jpg

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Head of line blocking

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HTTP1.1!! We need something better than 1 request 1 Request 1 Requests 2

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The best request is a request not being made

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triggering requests src=“…” url(…) link href=“…”

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reducing requests • Concatenation … 1 JS file, 1 CSS file • Image sprites • Inlining stuff

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httparchive.org

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40 TCP connections on average

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CSS JS

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CSS JS

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CSS JS JPG

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CSS JS JPG

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Server Client HTTP/2 Getting stuff …

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HTTP 1.1 index.html a.js b.js c.js d.js

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HTTP 2 index.html a.js b.js c.js d.js

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HTTP 2 index.html a.js b.js c.js d.js

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HTTP 2 index.html a.js b.js c.js d.js

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Desktop HTTP/2 ~1.8s HTTP1.1 ~2.6s

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mobile connections HTTP1.1 ~3.37s HTTP2 ~1.72

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A slow website on HTTP1.1 will still be a slow website on HTTP2

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Performance guidelines • Minifying JS and CSS • Optimising images • Gzipping your content • Do not block rendering These all still hold up!

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HTTP/2 is not (only) for Performance Optimisation, it is an Engineering Opportunity

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The best request is a request not being made

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HTTP 2 index.html a.js b.js c.js d.js

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HTTP 2 index.html a.js b.js d.js

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The best request is a request not being made

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agent.v1.svg cloud.v1.svg

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ExpiresDefault "access until Judgement Day”

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agent.v1.svg cloud.v2.svg

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So … yes!

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But wait …

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agent.v1.svg cloud.v2.svg

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agent.v1.svg

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agent.v1.svg

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agent.v1.svg That’s what we call a dependency

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In JavaScript payment.js hyped- framework.js lodash.js call-to-action.js validation.js

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In JavaScript payment.v1.js hyped- framework.v1 .js lodash.v1..js call-to- action.v1.js validation.v1.js

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In JavaScript payment.v1.js hyped- framework.v1 .js lodash.v1..js call-to- action.v2.js validation.v1.js

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In JavaScript payment.v1.js hyped- framework.v1 .js lodash.v1..js call-to- action.v2.js validation.v2.js

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Frequency of change Libraries Utilities Module Module Module Module rigid high frequency some frequency

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Optimised utility layer Libraries Utilities Module Module Module rigid high frequency some frequency

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Extending the utility layer Libraries Utilities Module Module Module rigid high frequency some frequency

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Files to change Libraries Utilities Module Module Module rigid high frequency some frequency

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Tree Shaking // module.js import { helper } from ‘pretty-huge-utility-lib’; helper(10);

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Tree Shaking // module.js import { helper } from ‘pretty-huge-utility-lib’; helper(10); // module-built.js function neededByHelper(inp) { return true; } function helper(inp) { return neededByHelper(inp); } helper(10);