Web Performance As An Essential Part Of The User Experience - BEC 17

by Thijs Feryn

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By Thijs Feryn Web performance as an essential part of the user experience

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Slow websites suck

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Web performance is an essential part of the user experience

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Slow ~ Down

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Saturated market

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Hi, I’m Thijs

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I’m @ThijsFeryn on Twitter

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I’m an Evangelist At

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Infrastructure

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Code

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Slow database

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Slow API call

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Browser rendering

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User location

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Time To First Byte

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DNS TCP TLS Request Response TTFB Render

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CODE + INFRA

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Identify slowest parts

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Reduce the impact of the code on the server

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Response times at increased concurrency Response times 0 35 70 105 140 Concurrency 10 50 100 150 200 250 300 350 400 450 500 Page 1 Page 2 Hypothetical example

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Not just raw speed

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Stable speed under increasing load Response times 0 10 20 30 40 Concurrency 10 50 100 150 200 250 300 350 400 450 500

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Refactor slow code Write fast code

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Optimize database

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Improve the API call

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Optimize runtime

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After a while you hit the limits

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E-commerce context

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Platforms Frameworks

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Mo money Mo servers

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High A vailability

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Recurring cost

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CAPEX

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Cache

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Optimize database Optimize runtime A void A void

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Don’t recompute if the data hasn’t changed

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3 x 2 = ?

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What can you cache? Byte code Database output External services Files from disk Pages

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Caching is not a compensation for poor code

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Caching is an essential architectural strategy

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Varnish

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Normally User Server

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With Varnish User Varnish Server

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Leverage HTTP for caching

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Cache-Control: public, max-age=500, s-maxage=3600 Vary: Accept-Encoding, Accept-Language ETag: 7ECE8823114E4155A2A72657BB2682D0 Surrogate-Control: key=ESI/1.0 Content-Encoding: deflate Transfer-Encoding: chunked

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E-commerce context

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Platform integration for Varnish, Memcached, Redis

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Combine Varnish & Redis

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Browser rendering

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Time To First Paint

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Time To First Meaningful Paint

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DNS TCP TLS Request Response TTF(M)P Render

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JPG PNG CSS ICO JS Sum of individual loading/rendering times WOFF JPG JPG PNG CSS CSS JS

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#Round Trips x Round Trip Time

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Reduce Round Trips

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Reduce Response Sizes

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✓ Compress images ✓ Illustrations in SVG format ✓ Inline images, CSS, JS ✓ CSS sprites ✓ Use “srcset” to get the right image size ✓ Uglify CSS/JS ✓ Combine CSS/JS files Reduce Response Sizes & Round Trips

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✓ Avoid blocking Javascript ✓ Chunked Transfer-Encoding ✓ Gzip compression for non-binary data ✓ Domain sharding for static assets ✓ HTTP/2 Reduce Response Sizes & Round Trips

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JPG PNG CSS JS HTML JPG JPG PNG CSS CSS JS domain.ext img.domain.ext static.domain.ext HTTP/1.1 domain sharding

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JPG PNG CSS JS HTML JPG JPG PNG CSS CSS JS domain.ext HTTP/2

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✓ Multiplexing requests over single connection ✓ Header compression ✓ Server push HTTP/2

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User location

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Network latency

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✓ Trans Atlantic: 75 ms ✓ Europe: 11 ms ✓ North America: 39 ms ✓ Trans Pacific: 102 ms ✓ Latin America: 133 ms ✓ EMEA to Asia Pacific: 131 ms Network latency

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3G & EDGE

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Content Delivery Network

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http://www.metacdn.com/

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Reverse caching proxies all over the world

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✓ Less latency ✓ Caching ✓ Serve stale data if origin site is down ✓ Output optimization ✓ Anti-DDoS measures CDN benefits

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Web performance is a discipline in its own

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https://feryn.eu https://twitter.com/ThijsFeryn https://instagram.com/ThijsFeryn