Web performance at Friends of Search 2024 (Arnout Hellemans)

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Performance Wake-up

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https://medium.com/@addyosmani/shopping-for-speed-on-ebay-com-6229711d7573

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Would you be willing to slow your site down 0.1 second ?

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Uncomfortable, isn’t it?

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"A 2012 detailed study at Bing (Kohavi et al.2013) showed that every 100 ms speedup improves revenue by 0.6%."* *Kohavi, Ron; Tang, Diane; Xu, Ya. Trustworthy Online Controlled Experiments: A Practical Guide to A/B Testing (p. 82).

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Performance optimization is just… optimization.

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WPO Stats, wpostats.com

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You’re competing for subconscious attention

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So, how are we doing?

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Bol.com

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gtmetrix.com 9,2MB network payload

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No content

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Are CWV a “ranking factor”?

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https://www.linkedin.com/feed/update/urn:li:activity:71736 81294403358721/

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Johan his excellent comment

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Is this just academic?

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1% of global electricity usage, and growing

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https://twitter.com/JohnMu/status/1768187387698364518

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Most websites are slow rotten. Why?

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developers and their decisions

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servers and systems

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scripts and styles

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ads and analytics

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measurement and monitoring

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tools and testing

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Are you measuring your measuring?

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https://gtmetrix.com/reports/yoast.com/AVp6IGIT/

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Chrome Developer Tools; “Network” tab

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~560kb in ~0.4 seconds

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No content

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GTM > GA + HotJar + GO

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GTM > GA + HotJar + GO = ~220kb

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GTM > GA + HotJar + GO = ~220kb = 40% of page weight

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GTM > GA + HotJar + GO = ~220kb = 40% of page weight = 0.1 second

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What’s the real world impact?

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No content

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2 trees

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!? Lots of trees Yikes.

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This isn’t everybody though, surely?

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So everybody’s favo urite hotel site is prob ably nailing it, right?

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Mountains of JS

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Mountains of JS = ~1.4mb (of ~3mb page)

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Mountains of JS = ~1.4mb (of ~3mb page) = ~+1.5 seconds

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Mountains of JS = ~1.4mb (of ~3mb page) = ~+1.5 seconds = $$$

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No content

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No JS JS

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No content

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How’s your site? (Spoiler: It’s probably worse)

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You have to optimize your optimizing.

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“But this stuﬀ is hard / new / alien” How do I do it?

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web.dev/vitals/ May 2020

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web.dev/vitals/ “INP” Interaction to Next Paint (12 March, 2024)

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INP example

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web.dev/chrome-ux-report-data-studio-dashboard/

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CWV fixes "It's hard to quantify"

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web.dev/optimize-vitals-lighthouse/ Specific recommendations!

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web.dev/patterns/web-vitals-patterns/ Patterns!

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developers.google.com/web/fundamentals/design-and-ux/responsive/images Advanced theory!

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web.dev/vitals-tools-workflow/ Workflows and processes!

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So, aren’t these are all solved problems?

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What happens in a real world scenario?

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No content

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Maybe the wrong people (or nobody) own this?

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Start with a business case

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Site performance is site-wide (and therefore doesn’t get prioritized)

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Environment (greener) Cost Saving Inclusivity Profitability Agility / Velocity Align with company values / goals

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e.g., CO2 impact

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CO2 impact x pageviews = number of trees to plant to oﬀset 28,000 trees!

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or cost saving

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Page transfer size x number of requests x $

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and code quality…

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Fewer errors Easier a/b testing faster development (velocity) Easier to scale development resources Optimised code leads to:

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And don’t forget about device tax…

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Inclusivity = Device tax or Connection tax

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No content

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12 million EUR / per 0.5 second

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Manage (control) stakeholder expectations You can be “creative” with forecasts…

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Got a dedicated, embedded team “Quality” isn’t a one-off process!

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CONGRATULATIONS We’ve made your roadmap for 2024.

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So, where do I start?

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Four tactical focus areas Code & nerdy stuff ng up!

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1. Caching

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What’s the fastest way to load something?

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Cache this “forever”

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(but not if I update it)

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2. Images

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What format? AVIF > WEBP > PNG/JPG

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Squoosh.app

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3. Fonts

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Third-party resources = slow

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@font-face { font-family:'Rubik'; src: url('/fonts/rubik.woff2’); } self-hosting = faster woff2 = faster fetchpriority = new

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@font-face { font-family:'Rubik'; font-style:normal; font-weight:400; font-display:swap; unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; src:local('Rubik'), local('Rubik-Regular'), url('/fonts/rubik-latin-400.woff2?ver=1606167081') format('woff2'); } @font-face { font-family:'Rubik'; font-style:normal; font-weight:700; font-display:swap; unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; src:local('Rubik Bold'), local('Rubik-Bold'), url('/fonts/rubik-latin-700.woff2?ver=1606167081') format('woff2'); } Manage weight, style, display, and glyphs