"You’re probably using Lighthouse wrong: How do we misuse the most common tool to measure web performance?", Filip Rakowski
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May. 20, 2023•0 likes•72 views
"You’re probably using Lighthouse wrong: How do we misuse the most common tool to measure web performance?", Filip Rakowski
May. 20, 2023•0 likes•72 views
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These days, web performance is one of the most important things everyone wants to optimize on their apps, and it's clear to everyone how dramatic the impact of a poorly optimized website is on business. Yet we as an industry completely fail in recognizing its complexity and widely misuse the most common tool to measure it — Google Lighthouse. If you’re one of those people thinking that good performance equals a good Lighthouse score, you’ve also fallen into this trap and this talk is for you. You will learn when the Google Lighthouse audit results can trick you and how to make good decisions based on its output.
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"You’re probably using Lighthouse wrong: How do we misuse the most common tool to measure web performance?", Filip Rakowski
- 1. You’re Probably Using Lighthouse Wrong
- 2. Filip Rakowski Co-founder & Chief DX Officer Technology Council Member I’m on Twitter! @filrakowski
- 3. Accelerate and simplify the development of storefronts! /vuestorefront
- 10. - @filrakowski 2017: Mobile phones are becoming preferred way of consuming the web. Colorized.
- 11. - @filrakowski 15,3s Average Loading Time on Mobile, Google Research, 2017
- 12. - @filrakowski Google Lighthouse April 2018 - Lighthouse lands in Chrome!
- 13. - @filrakowski
- 14. - @filrakowski
- 16. @filrakowski
- 17. @filrakowski
- 18. @filrakowski
- 19. @filrakowski
- 20. Good decision = DATA + CONTEXT
- 21. @filrakowski
- 22. @filrakowski
- 23. @filrakowski
- 24. @filrakowski
- 27. @filrakowski
- 28. It matters A LOT where you run the audit
- 29. @filrakowski Chrome Devtools ● Results affected by your internet speed and CPU (even with throttling) ● Chrome extensions can significantly impact the result (use incognito!) ● Generally not very reliable
- 30. @filrakowski Page Speed Insights ● Runs at closest Google Data Center (if it has bandwidth) ● Shows both field data from real users (top) and lab data from Lighthouse
- 32. @filrakowski Pagespeed Insights Real-world data (your users) collected from CrUX Results of LH audit run on Google Data Center IMPACTS SEO!
- 33. Be suspicious about Lighthouse score - it’s easy to trick it
- 34. @filrakowski
- 35. @filrakowski
- 36. When and how does it make sense to use Lighthouse?
- 37. Good performance is a tradeoff @filrakowski
- 38. Use Lighthouse to get a perception of how new release will affect your performance @filrakowski
- 39. Don’t use Lighthouse to measure how your users experience your website @filrakowski
- 40. @filrakowski
- 41. @filrakowski
- 42. Lighthouse and real-world data can be very different
- 43. @filrakowski
- 44. Thank you! vuestorefront.io/developer-newsletter Daily(ish) tips about webperf, vue, Nuxt and whatever I find interesting. @filrakowski