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You’re Probably Using
Lighthouse Wrong
Filip Rakowski
Co-founder & Chief DX Officer
Technology Council Member
I’m on Twitter!
@filrakowski
Accelerate and
simplify the
development of
storefronts!
/vuestorefront
-
@filrakowski
fn(⚡) = 💰
-
@filrakowski
-
@filrakowski
_2017_
-
@filrakowski
-
@filrakowski
-
@filrakowski
We are here
-
@filrakowski
2017: Mobile phones are becoming preferred way of consuming
the web. Colorized.
-
@filrakowski
15,3s
Average Loading Time on Mobile,
Google Research, 2017
-
@filrakowski
Google Lighthouse
April 2018 - Lighthouse lands in Chrome!
-
@filrakowski
-
@filrakowski
-
@filrakowski
👍
👎
@filrakowski
@filrakowski
@filrakowski
@filrakowski
Good decision = DATA + CONTEXT
@filrakowski
@filrakowski
@filrakowski
@filrakowski
How Lighthouse works?
@filrakowski
googlechrome.github.io/lighthouse/scorecalc/
@filrakowski
It matters A LOT where
you run the audit
@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
@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
@filrakowski
Pagespeed Insights
@filrakowski
Pagespeed Insights
Real-world data
(your users) collected from
CrUX
Results of LH audit run on
Google Data Center
IMPACTS SEO!
Be suspicious about
Lighthouse score - it’s
easy to trick it
@filrakowski
@filrakowski
When and how does it
make sense to use
Lighthouse?
Good performance is a tradeoff
@filrakowski
Use Lighthouse to get a
perception of how new release
will affect your performance
@filrakowski
Don’t use Lighthouse to
measure how your users
experience your website
@filrakowski
@filrakowski
@filrakowski
Lighthouse and real-world
data can be very different
@filrakowski
Thank you!
vuestorefront.io/developer-newsletter
Daily(ish) tips about webperf, vue, Nuxt and whatever I find interesting.
@filrakowski

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"You’re probably using Lighthouse wrong: How do we misuse the most common tool to measure web performance?", Filip Rakowski