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When can they
read the article?
When can they
start the task?
When can they
add to basket?
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“
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result
effort
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performance
effort
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conversion
load time
speed index
cart abandonment
upsell
bounce rate
first paint
page size
document complete
lifetime value
cost of acquisition
session length
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Performance is in the
eye of the beholder
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2s 4s 6s 8s 10s 12s
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Speed Index of every page view for every customer?
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Time to First Byte 0.34
First Paint 0.74
Visually Complete 0.78
DCL End 0.70
Load Time 0.74
Requests 0.34
Page Size 0.43
Alternative Metrics / Correlation with Speed Index
(Alexa & Quantcast top 1,000 sites)
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Speed Index
Load Time (ms)
Video impacts visual
performance
450 third-party objects
impact load time
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Bounce Rate
Council
ECommerce
Holidays
Page Load Time
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Page Load Time
Session Length
Council
ECommerce
Holidays
4s
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50% of customer experiences > 5 seconds!
Flat between 1.8s & 4.3s
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Smartphone experience worst
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Android worse than iPhone
Mode = 4.7s!
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Visitor experience varies
Measure these experiences in the wild
Load time is a good indicator of experience
Load times over four seconds are catastrophic to user engagement
Best user engagement is at 1 second or less
Visitors expect mobile to be as fast as desktop
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Is your site faster than four seconds?