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Web Performance for
 LAMP developers

    Sergey Chernyshev

       @SergeyChe
Performance? Why?
User experience

$$$ Money $$$

• Shopzilla +7-12% conversions!
  & -50% operation costs

• +15% (+60M) downloads for Firefox.
  (-1sec => +2.7% downloads)

• Slowness is sticky (Google and Microsoft)
SEO: Google uses site's speed in ranking
"Front-end"

• Read waterfall diagrams

• Measure user's version of performance

• Use browser's cache

• "Compile" your web apps
Water
falls
Metrics
• TTFB

• Time to load

• Time to first render

• Above the Fold (AFT)

• Your business metrics

• Technical metrics (# of requests, page size, etc)
Quick wins!
        gzip
  (Apache configuration)



Browser Caching
  (Apache & PHP code)
gzip

reduction of download time
   ~75% for text-based
       ~37% total
Use Browser Cache
Know your last update




No download time is spent
Use Browser Cache
Never expire specific URL




Use update time as fingerprint
Compile

• Combine CSS and JavaScript

• Minify CSS, JavaScript and even HTML

• Optimize images

• Version static / code URLs
Drop-in .htaccess
Trends
Track your metrics over time

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Web performance for LAMP developers (front end)