Speed is feature #1
- 1. Speed is Feature #1
Sergey Chernyshev
!
NY Web Performance & CSS/UX Meetup
January 15, 2015
- 6. Slowness Damages Business
100ms delay -> -1% of sales.
(Amazon, 2006)
400ms delay -> -5 - 9% full-page traffic.
(Yahoo autos, 2008)
500ms delay -> -25% searches.
(Google, 2007)
- 7. Long-term Brand Effects
Slowness damages
the brand.
(Google, Microsoft,
2009)
Google uses speed
in search result
ranking (SEO) and
quality score
(AdWords)
- 8. Speed Means Business
+3% ad revenue, +17% page views per session.
(Edmunds, 2010)!
+7-12% conversions! 50% reduction in operation costs
(Shopzilla, 2009)!
+15% (+60M) downloads, each 1sec increased 2.7%
downloads (Firefox, 2010)
- 9. Fred Wilson
Managing Partner, Union Square Ventures @ NYC
http://www.aVC.com/
“1. Speed is
the most
important
feature.”
10 Golden Principles of Successful Web Apps http://vimeo.com/10510576
- 14. Fast Content
Static content
Caches (APC, memcache, Varnish, CDN, browser)
Flush HTTP stream early / multiple times
http://calendar.perfplanet.com/2014/async-fragments-rediscovering-progressive-html-
rendering-with-marko/
Optimize
- 22. Load just enough code
Use modern tech where
aplicable
Don’t copy desktop features
1-to-1
Fast and Responsive
Tim
Kadlec