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How to validate your site speed optimization efforts Loukil Aymen SPEETALS Speakerdeck.com/aymenloukil @aymenloukil @LoukilAymen

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Site speed matters for Users SEO Conversions Brand reputation Inclusiveness Accessibility Costs

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Site speed matters for Users SEO Conversions Brand reputation Inclusiveness Accessibility Costs Business

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals It costs money. 1500$ /day Web Performance Consultant.

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@LoukilAymen #BrightonSEO Speetals 1$ every 30 seconds

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Did it even work ? Effort and investment Impact

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals No impact evidence Effort and investment Impact

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Projects can easily go wrong 💰Migration 😱 TTFB X 2

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Main reasons Inadequate tools/data

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Main reasons Inadequate tools/data Inadequate metrics

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Main reasons Inadequate tools/data Inadequate metrics Unclear expectations

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@LoukilAymen #BrightonSEO Speetals Let’s make Web Performance more predictable and impact proven

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@LoukilAymen #BrightonSEO Speetals How to validate site speed efforts?

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@LoukilAymen #BrightonSEO Speetals Use Google Lighthouse! Jonathon Burton

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@LoukilAymen #BrightonSEO Speetals Check my 2023 Brighton’s talk https://www.youtube.com/@AymenLoukil

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@LoukilAymen #BrightonSEO Speetals Set up right tools, Measure, know you current performance and get a history Set a baseline The Lazy Artist Gallery

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@LoukilAymen #BrightonSEO Speetals You need real users data using your product..

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@LoukilAymen #BrightonSEO Speetals You need real users data browsing your website…

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@LoukilAymen #BrightonSEO Speetals Real User Monitoring RUM

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@LoukilAymen #BrightonSEO Speetals RUM is like weather stations

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@LoukilAymen #BrightonSEO Speetals Weather station Real-time weather conditions Rain, wind, sun… Monitor, alert, and predict Image: RitaE Pixabay tailulai

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@LoukilAymen #BrightonSEO Speetals RUM Real-time users data and interactions

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@LoukilAymen #BrightonSEO Speetals RUM Real-time users data and interactions Fast, slow, laggish experiences

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@LoukilAymen #BrightonSEO Speetals RUM Real-time users data and interactions Fast, slow, laggish experiences Prioritize, monitor, alert, validate

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@LoukilAymen #BrightonSEO Speetals Clear view of your users experience Main benefits Masood Aslami

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@LoukilAymen #BrightonSEO Speetals Optimize and see the impact Main benefits Clear view of your users experience Masood Aslami

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@LoukilAymen #BrightonSEO Speetals RUM data is the cream of the crop Somben Chea

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals It’s site speed not the NASA RUM tool should be simple to use

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@LoukilAymen #BrightonSEO Speetals How to take benefit from RUM data?

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Split and break down https://www.stiernholm.com/en/blog/how-to-divide-a-large-task-into-smaller-pieces

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Break down, get value Ella Olsson 2$ 17$ 5$

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Segment the data Device...

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Segment the data Device, Connection type...

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Segment the data Device, Connection type, Location...

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Segment the data Device, Connection type, Location, Navigation type...

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Segment the data Device, Connection type, Location, Navigation type, CPU, …

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Segment the data Device, Connection type, Location, Navigation type, CPU, Device memory…

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Segment the data Device, Connection type, Location, Navigation type, CPU, Device memory, Page type…

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Different locations

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals X2 TTFB CLS fails

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Different connection types 4G 3G

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Perfect LCP VS Poor LCP 4G 3G

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals https://web.dev/case-studies/vitals-business-impact

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals AVG depth of 1m

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Would you feel safe to cross the lake walking? AVG depth of 1m

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Web Performance data is asymmetric, so don’t chase averages.

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@LoukilAymen #BrightonSEO Speetals Averages are miƨlɘɒbinϱ George Becker

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals You do need PERCENTILES

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Scan your audience 25th percentile 75th percentile 95th percentile

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals 5% of the users got an LCP > 3.3s 75% of the users got an LCP <= 1.3s

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Inadequate tools/data Inadequate metrics Unclear expectations Main reasons

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@LoukilAymen #BrightonSEO Speetals Optimization need to be small, isolated, and atomic

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@LoukilAymen #BrightonSEO Speetals Atomic optimizations, easier validation Markus Spiske

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@LoukilAymen #BrightonSEO Speetals Add “Fetchpriority” high to hero image

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@LoukilAymen #BrightonSEO Speetals Add “Fetchpriority” high to hero image Metric: LCP Page type: PDP Device: Mobile, Desktop Location: Belgium

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@LoukilAymen #BrightonSEO Speetals Description : The main product image should have the fetchpriority="high" attribute set in its HTML tag. The browser should prioritize downloading the main product image over other less critical resources. Add “Fetchpriority” high to hero image Metric: LCP Page type: PDP Device: Mobile, Desktop Location: Belgium

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@LoukilAymen #BrightonSEO Speetals [..Description..] How can we measure the impact ? RUM data, PDP segment. LCP percentiles and distribution. Exclude Firefox (doesn’t support) Add “Fetchpriority” high to hero image Metric: LCP Page type: PDP Device: Mobile, Desktop Location: Belgium

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Site speed validation Takeaways Atomic optimizations Get RUM & learn to use Adequate metrics

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@LoukilAymen #BrightonSEO Speetals @LoukilAymen #BrightonSEO Speetals Hey, I’m Aymen International Web Performance Consultant speetals.com