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Community: Performance Recommendations

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Application-level Techniques

  • Application cache
  • Use a CDN to deliver images from multiple domains (for parallel in stream to counter HTTP 1.1 spec)
  • Place all <style> and <link> in <head>
  • Place all app-specific <script> at the bottom of
  • Make <script> and <link> external rather than inline to minimize non-cached response time
  • Reduce redirects
  • In PHP, flush the buffer right after with flush()
  • Sprite images
  • Use pngcrush and jpegtran
  • Use image compressor, don't scale images
  • Keep components under 25K so that iPhone will cache them
  • Keep DOM small

Server-level Techniques

  • Apache 2 mod_deflate (or Apache 1.3 mod_gzip) to gzip files
  • Use a CDN to deliver images from multiple domains
  • Use cookie-free domains for components
  • Apache Keep-Alive header

Framework-level Techniques

  • Javascript benchmarking
  • Revisiting the Cache headers
  • Tighten up "domain" on cookies (explicit)
  • Always use event handlers smartly (tighten the number of listeners)
  • Convert to using imagemagik (from GD) and optimize as necessarily
  • Keep components under 25K so that iPhone will cache them (js.php is 27 KB currently)

From 2011-09-29 Meeting Focus on Performance

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