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How Slow Load Times Hurt Your Bottom Line
@tameverts Web Unleashed 2015 #WebU
@tamevertsperformancebeacon.com
Do MOST people consider page speed an important part of user
engagement?
“I myself wouldn’t consider it very important. Granted, if a page is too slow, it loses users, but I believe if a page loads in 5 or 6 seconds, it doesn’t make much difference.”
@tameverts
http://www.soasta.com/blog/web-performance-mothers-day
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http://www.soasta.com/blog/mobile-web-performance-monitoring-conversion-rate
/
2% increase in conversions for every 1 second of improvement
@tameverts
Increased conversions by 9%
Cut load times in half
@tameverts
Reduced average load time by 2.2 seconds and increased total downloads by 15.4%10 million additional downloads per year
@tameverts
@tameverts
How do visitors feel about slow sites?
(hint: not good)
@tameverts
@tameverts
17 things you can do to deliver
a faster user experience
Steve Souders, author, ‘High Performance Web Sites’
“80-90% of end-user response time is at the front end. Start there.”
@tameverts
1 Page size2 Page complexity
Two main performance problems
@tameverts
Problem 1: Pages are too big
@tameverts
@tameverts
More bandwidth isn’t the answer
http://www.soasta.com/blog/more-bandwidth-isnt-a-magic-bullet-for-web-performance
/
Single greatest indicator of fast performance?
Faster pages are less than 1MB in
size@tameverts
Know where your page weight is coming fromCreate a performance budgetMonitor, monitor, monitor
Solutions
@tameverts
@tameverts
Setting a performance budgethttp://timkadlec.com/2013/01/setting-a-performance-budget/
Performance budget metricshttp://timkadlec.com/2014/11/performance-budget-metrics/ @tameverts
HTTP Archive, June 2015
@tameverts
@tameverts
ReformatCompressDefer/lazy loadAdaptive imagesAuto-preloading
Solutions
@tameverts
Problem 2: Pages are too complex
@tameverts
@tameverts
@tameverts
@tameverts
@tameverts
webpagetest.org
MonitorConsolidate page resourcesMake sure stylesheets are in the document HEADHost your fontsOptimize your pop-up scripts
Solutions
@tameverts
Third-party contentcan make up >50%
of page requests
@tameverts
Increase page weightIncrease number of hosts and connectionsIntroduce additional latencyPrevent pages from loading
Problems
@tameverts
Defer scriptsUse asynchronous versions (when possible)Know your scripts and their performance penaltiesMonitor constantly
Solutions
@tameverts
@tameverts
@tamevertsperformancebeacon.com
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