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The Hidden Truth Behind Your Google Lighthouse Score

The Hidden Truth Behind Your Google Lighthouse Score

Join Aymen Loukil as he delves into the challenges that arise in web performance when relying solely on synthetic tools and their scoring systems. Although these tools are invaluable for debugging and testing web performance, they cannot accurately represent the experience of real-life website users. Aymen will share his insights gained from a retrospective analysis of web performance measurement methodology. He will discuss his findings on how to overcome these challenges and gain a better understanding of the user experience thanks to real user monitoring data

Aymen Loukil

June 13, 2023
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  1. The Hidden Truth Behind Your
    Google Lighthouse Score!
    Aymen Loukil
    Speetals Founder
    https://speetals.com/

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  2. @LoukilAymen
    @SearchLDN
    Back to 2017, this was my #webperf
    workflow
    Audit in Lab
    Write user
    stories
    Implement
    Test in Lab

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  3. @LoukilAymen
    @SearchLDN
    Awesome!

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  4. @LoukilAymen
    @SearchLDN
    Me excited
    Ship it!

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  5. @LoukilAymen
    @SearchLDN
    We need to wait for the next CrUX
    dataset (in 28 days)
    [Every second Tuesday]

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  6. @LoukilAymen
    @SearchLDN
    Users faced improvement
    deterioration!
    Feb 2020
    Mar 2020
    73% => 70.8%

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  7. @LoukilAymen
    @SearchLDN
    A shot in the dark!

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  8. @LoukilAymen
    @SearchLDN

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  9. @LoukilAymen
    @SearchLDN
    I’ve also been part of this!

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  10. @LoukilAymen
    @SearchLDN

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  11. @LoukilAymen
    @SearchLDN
    Gabriela Palai - Pexels
    What’s wrong with
    Lighthouse score…?

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  12. @LoukilAymen
    @SearchLDN
    One LH run may or not represent one
    of your users

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  13. @LoukilAymen
    @SearchLDN
    Emulation isn’t real life..

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  14. @LoukilAymen
    @SearchLDN
    50% of
    perfect
    Lighthouse
    score (90+)
    pages fail at
    Web Vitals
    Brendan Kenny
    @brendankenny

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  15. @LoukilAymen
    @SearchLDN
    With a score of
    50/100, many
    pages passes
    the Web Vitals
    Brendan Kenny
    @brendankenny

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  16. @LoukilAymen
    @SearchLDN
    There is a blind
    spot!

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  17. @LoukilAymen
    @SearchLDN
    Are they at least talking the same
    metrics?

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  18. @LoukilAymen
    @SearchLDN
    Ultimately they don’t share as many
    metrics!

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  19. @LoukilAymen
    @SearchLDN
    Ultimately they don’t share as many
    metrics!
    Above the
    fold only CLS

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  20. @LoukilAymen
    @SearchLDN
    Ultimately they don’t share as many
    metrics!
    Above the
    fold only CLS
    Depends on
    conditions

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  21. @LoukilAymen
    @SearchLDN
    Variability issues
    3 consecutive runs on the same page and on same conditions

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  22. @LoukilAymen
    @SearchLDN
    It is like Rock paper scissors

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  23. @LoukilAymen
    @SearchLDN
    You can easily trick it!
    Barry Pollard
    @tunetheweb

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  24. @LoukilAymen
    @SearchLDN
    My customer’s Web agency

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  25. @LoukilAymen
    @SearchLDN
    You can even hack it!

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  26. @LoukilAymen
    @SearchLDN
    Lighthouse score does not affect SEO

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  27. @LoukilAymen
    @SearchLDN
    Do you mainly care
    about your users
    or Lighthouse score

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  28. @LoukilAymen
    @SearchLDN
    So..Rely on your
    Users’ data, And
    here is how👉

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  29. @LoukilAymen
    @SearchLDN
    Remember my failed #webperf
    workflow?
    Audit in Lab
    Write user
    stories
    Implement
    Test in Lab
    https://www.vectorstock.com/
    https://knowyourmeme.com/

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  30. @LoukilAymen
    @SearchLDN
    Audit in field
    Prioritize
    Implement
    Test in Lab
    Fast validate
    on users
    Hear your users experience, validate your effort with them
    Iterate
    User first #webperf workflow

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  31. Audit in the field
    (Hear your users experience)
    STEP 1

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  32. @LoukilAymen
    @SearchLDN
    Identify improvement points for each metric/
    device

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  33. @LoukilAymen
    @SearchLDN
    Identify improvement points for each
    metric/ device
    Detect distribution gaps between devices

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  34. @LoukilAymen
    @SearchLDN
    See how your audience LCP distributes

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  35. @LoukilAymen
    @SearchLDN
    See how your audience distributes
    75% of your
    users are
    facing a 6.1s
    LCP
    loading!!

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  36. @LoukilAymen
    @SearchLDN
    Compare against competition’ audience
    experiences

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  37. @LoukilAymen
    @SearchLDN
    How my geo-audience is experiencing it

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  38. Prioritize.
    (Do the right thing first)
    STEP 2

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  39. @LoukilAymen
    @SearchLDN
    Sort your top page-types per metric
    Domain data Page-level data


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  40. @LoukilAymen
    @SearchLDN
    Identify low-hanging fruits
    Start with this
    listing page
    template

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  41. Implement & Audit in lab.
    (Implement, test)
    STEP 3

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  42. Validate the outcomes.
    (Don’t wait 28 days..)
    STEP 4

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  43. @LoukilAymen
    @SearchLDN
    34%+ Desktop CLS increase in 10 days - PDP
    Validated
    Deployed

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  44. @LoukilAymen
    @SearchLDN
    LCP P75th percentile chart going down!
    4.2s => 2.3s

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  45. Thank you!
    Aymen Loukil
    @LoukilAymen
    https://speetals.com
    International SEO and Web
    Performance Consultant

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