Web performance for LAMP developers (front end) - Speaker Deck

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Web Performance for LAMP developers Sergey Chernyshev @SergeyChe

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Performance? Why? $$$ Money $$$ • Shopzilla +7-12% conversions! & -50% operation costs • +15% (+60M) downloads for Firefox. (-1sec => +2.7% downloads) • Slowness is sticky (Google and Microsoft) User experience SEO: Google uses site's speed in ranking

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"Front-end" • Read waterfall diagrams • Measure user's version of performance • Use browser's cache • "Compile" your web apps

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Water falls

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Metrics • TTFB • Time to load • Time to ﬁrst render • Above the Fold (AFT) • Your business metrics • Technical metrics (# of requests, page size, etc)

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Quick wins! gzip (Apache conﬁguration) Browser Caching (Apache & PHP code)

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gzip reduction of download time ~75% for text-based ~37% total

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Use Browser Cache Know your last update No download time is spent

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Use Browser Cache Never expire speciﬁc URL Use update time as ﬁngerprint

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Compile • Combine CSS and JavaScript • Minify CSS, JavaScript and even HTML • Optimize images • Version static / code URLs

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Drop-in .htaccess

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Trends Track your metrics over time