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browser smush.it YSlow 2.0, Page Speed JavaScript: The Good Parts Velocity this past year

how does your web feel?

why? web site owners 1.don't know their web site is slow 2.don't know what is slow 3.don't know how to fix it 4.don't/can't prioritize the fix

my site slow? really?? easy instrumentation – Jiffy + AppEngine community opt-in – a la Alexa trends messaging visualizations – MSFast

what to fix HttpWatch, Firebug Net Panel, Fiddler sample size? non-network – HTML, JS, CSS

how to fix it YSlow, Page Speed, Pagetest, VRTA, neXpert, MSFast sample size? non-network – HTML, JS, CSS backend

prioritizing the fix tradeoffs, ROI Bing: +1 second == -2.8% revenue Google: +400ms == -0.76% searches/user Shopzilla: faster: +7-12% revenue, -50% nodes wow versus infrastructure technical constraints

BHAP single threaded browsers level of difficulty connection speeds mobile ads

things are getting better March 2007 March 2009 future Expires26%93% gzip CSS, JS5/1010/10 sprites2/109/10 minify JS4/109/10 AOL, eBay, Facebook, Google Search, Live Search, MSN, MySpace, Wikipedia, Yahoo, YouTube

don't give up optimize locally think globally cache "compiled" JS multipart downloads prefetching, preferred caching WordPress, PHP, Dreamhost fast-by-default Internet infrastructure