Building Performance for the Long Term

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KSPRATTART.ETSY.COM Building Performance FOR THE LONG TERM ALLISON MCKNIGHT @aemcknig Smashing Conference London 2018

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FREEFOLDING.ETSY.COM

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“We build for the long term.”

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Without a performance culture, performance is not sustainable.

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PIEINTHESKYCRAFTS.ETSY.COM

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Getting buy-in Understanding performance Empowering teams To infinity and beyond AGENDA SORADESIGNS.ETSY.COM

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LINMREGEL.ETSY.COM

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LIXXIEBERRY.ETSY.COM

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Getting buy-in for performance

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SCANDIPRINTSTUDIO.ETSY.COM GETTING BUY-IN • Performance work isn’t given priority • At your company • On your team

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Time, resources, and support necessary for performance work GETTING BUY-IN FROM  YOUR BOSS

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Makes performance work sustainable by involving creators GETTING BUY-IN FROM  YOUR COWORKERS

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SEWCADENCE.ETSY.COM Which business metrics are most important for your company?

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Link performance to business metrics

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160 KB added images 12% increase in  bounce rate MOLLYMCSHABBY.ETSY.COM

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MOUNTAINMOLEHILL.ETSY.COM

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www.wpostats.com

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www.wpostats.com

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performance business

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But those sites were slow. Our site isn’t slow! Very Important Person, Your Company

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SALOMIJOUBERT.ETSY.COM

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But those sites were slow. Our site isn’t slow! Very Important Person, Your Company

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Show, don’t tell

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Be accountable to your users

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Site Performance Report

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Site Performance Report

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“Load time is important, the quicker, the better!” “Looks like great improvements to me! Can’t wait to see how other features are going to be optimized! Thanks for working so hard engineering team!” “Cool! Keep up the good work.” Comments

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Understanding performance

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SCANDIPRINTSTUDIO.ETSY.COM UNDERSTANDING PERFORMANCE • You don’t know how fast (or slow) your users’ experiences are • You don’t know why your users’ experiences are fast (or slow)

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JEANLUCBEGHINPRINTS.ETSY.COM

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❤ Metrics ❤ • How is my site’s performance? • How is my site’s performance changing? • Where are performance issues coming from?

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Metrics • How is my site’s performance? • How is my site’s performance changing? • Where are performance issues coming from?

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Synthetic Real User Monitoring (RUM)

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Synthetic • Artificial page loads • Controlled, consistent environment XRAYANN.ETSY.COM “Why does my site  perform this way?”

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XRAYANN.ETSY.COM Real User Monitoring (RUM) • Timing from real users • Represents your user base “How is my site performing for my real users?”

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DEFINITELY BOTH DEFINITELY BOTH DEFINITELY BOTH

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Empower teams

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SCANDIPRINTSTUDIO.ETSY.COM • Your organization understands the value of performance • You have built infrastructure that helps you understand your site’s performance EMPOWERING TEAMS

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Integrate performance into  product workflows

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❤ Graphs ❤

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NAUSICAADISTRIBUTION.ETSY.COM

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Always be A/B testing! NAUSICAADISTRIBUTION.ETSY.COM

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ADRAGONFLYSVINTAGE.ETSY.COM ?

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50%

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100% 50%

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Always be integrating! NAUSICAADISTRIBUTION.ETSY.COM

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Sonic Search experience performance improvements 2 Make the market page more shiny Pages impacted A/B test Negatively impacting 1 page

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Sonic Make the homepage more shiny market variant control

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Help teams understand why performance is changing

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Synthetic XRAYANN.ETSY.COM “Why does my site  perform this way?”

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Teach tools and practices

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Performance Budgets Metric How to measure Target Total page load time RUM, 95th percentile 2 seconds Speed Index WebPagetest (Dulles, Cable) 1,200 Total page weight - web WebPagetest (signed in) 2000 KB Total page weight - mobile WebPagetest (signed in) 1000 KB

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Performance Budgets • Make optimizations to the new feature to get within budget • Optimize or remove an existing feature to make space • Don’t include the new feature this is okay

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Make informed decisions  about tradeoffs PERFORMANCE BUDGETS

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To infinity and beyond

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Expand

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You don’t have to start measuring everything all at once TO INFINITY AND BEYOND