Os Souders

High Performance Web Sites 14 rules for faster pages Steve Souders Chief Performance Yahoo! [email_address]

Exceptional Performance ,[object Object],[object Object],[object Object],[object Object]

The Importance of Frontend Performance Backend = 5% Frontend = 95% Even primed cache, frontend = 88%

Time Spent on the Frontend 95% 97% youtube.com 88% 95% yahoo.com 88% 80% wikipedia.org 86% 96% myspace.com 95% 97% msn.com 64% 86% google.com 92% 98% ebay.com 92% 81% cnn.com 86% 94% aol.com 86% 82% amazon.com Primed Cache Empty Cache

The Performance Golden Rule ,[object Object],[object Object],[object Object],[object Object]

14 Rules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Case Study: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],40-50%

Browser Cache Experiment ,[object Object],[object Object],[object Object],# users with at least one 200 response total # unique users Percentage of users with an empty cache? Percentage of page views with an empty cache? # of 200 responses total # responses

Browser Cache Expt Results 40-60% ~20% page views with empty cache users with empty cache

Experiment Takeaways ,[object Object],[object Object]

Evangelism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

YSlow ,[object Object],[object Object],[object Object],[object Object],[object Object]

Ten Top U.S Web Sites 139K 178K 106K 205K 221K 18K 275K 502K 182K 405K Page Weight 9.6 sec 5.9 sec 6.2 sec 7.8 sec 9.3 sec 1.7 sec 9.6 sec 22.4 sec 11.5 sec 15.9 sec Response Time D www.youtube.com A www.yahoo.com C www.wikipedia.org D www.myspace.com F www.msn.com A froogle.google.com C www.ebay.com F www.cnn.com F www.aol.com D www.amazon.com YSlow Grade

Strong Correlation total page weight response time inverse YSlow grade correlation(resp time, page weight) = 0.94 correlation(inverse YSlow, resp time) = 0.76 correlation(inverse YSlow, page weight) = 0.59

Takeaways ,[object Object],[object Object],[object Object],[object Object],[object Object]

CC Images Used ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Os Souders

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