Why is Web Performance Important?And why you should care about it
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First lets define performance (in terms that relate to us)
The perception of response timesJakob Nielsen
100ms 1s 10s
Insta
nt
Seam
less
Yawn!
Response Time in Man-computer Conversational TransactionsRobert B. Miller, 1968
And why is performance important to users of machines?
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“…participants had to concentrate up to 50% more when using badly performing websites” Foviance
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Context
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Slower web performance has a clear and measureable impact on people at a neurological levelhttp://www.radware.com/mobile-eeg2013/
Q: Given that we now know performance is valued by users of machines, how does it impact the machine owners?
A: We study it!
“The results suggest that slower page speed affects the brand on a more global level”http://www.radware.com/mobile-eeg2013/
Page speed matters for site conversion, revenue and SEOWalmart
$$$
+12% +25% -50%
Shopzilla cut load times by 5 secondshttp://velocityconf.com/velocity2009/public/schedule/detail/7709
Abandonment rate for 200+ sites / 177+ million page views over 2 weeks – Measureworks / Gomez
Amazon, bing and Google all found that as load time increased, revenue (searches) decreasedhttp://velocityconf.com/velocity2009/public/schedule/detail/8523
+s -%
= £
“85% of mobile users expect sites to load at least as fast or faster than sites on their desktop”Strangeloop Networks
Ok, so we know that there is a problem.How do we fix it?
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This man gave us a steer
In the beginning there was the rules.These were the web performance commandments.
What can we do about these issues?Fix them through better dev practices…