Please Don't Touch the Slow Parts
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Talk i gave at Better Software on May 5th 2010, together with Fullo of Ideato. It's about improving web applications speed. Based on Steve Souders work. I'll be giving a newer version of the talk at PHP Day 2010 Also http://www.ideato.it/ http://federico.galassi.net/ http://www.stevesouders.com/ http://www.bettersoftware.it/ http://www.phpday.it/ Follow me on Twitter https://twitter.com/federicogalassi
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Please Don't Touch the Slow Parts
- 1. Please Don’t Touch the Slow Parts francesco.fullone@ideato.it http://www.ideato.it/ federico.galassi@gmail.com http://federico.galassi.net/ Saturday, May 8, 2010
- 2. Saturday, May 8, 2010
- 3. fast er Saturday, May 8, 2010
- 4. fast er WEB Saturday, May 8, 2010
- 5. Faster == Better? Saturday, May 8, 2010
- 6. We have to wait Saturday, May 8, 2010
- 7. ... All the time Saturday, May 8, 2010
- 8. “Savings in time feels like simplicity” Saturday, May 8, 2010
- 9. “Time is the only commodity that matters” Saturday, May 8, 2010
- 10. Faster web, more clicks http://www.stevesouders.com/blog/2009/07/27/wikia-fast-pages-retain-users/ Saturday, May 8, 2010
- 11. Faster web, better SEO http://googlewebmastercentral.blogspot.com/2010/04/using-site-speed-in-web-search-ranking.html Saturday, May 8, 2010
- 12. Faster web is hot Saturday, May 8, 2010
- 13. Say web, Say browser Saturday, May 8, 2010
- 14. How browsers work Saturday, May 8, 2010
- 15. User clicks on a link Saturday, May 8, 2010
- 16. Browser resolves domain name DNS UDP www.google.com 72.14.234.104 domain Saturday, May 8, 2010
- 17. Browser connects to web server WEB TCP/IP 72.14.234.104 domain connect Saturday, May 8, 2010
- 18. Browser sends a request for a page WEB HTTP GET /language_tools?hl=en Host: www.google.com domain connect send Saturday, May 8, 2010
- 19. Browser receives a response with the page WEB HTTP 200 OK domain connect send receive Saturday, May 8, 2010
- 20. Browser renders the new page domain connect send receive render Saturday, May 8, 2010
- 21. Rendering is complex parse + paint render Saturday, May 8, 2010
- 22. Rendering really complex parse + paint + resources render css css img img javascript javascript flash Saturday, May 8, 2010
- 23. Each resource is another web request render Saturday, May 8, 2010
- 24. Requests are processed in parallel render Saturday, May 8, 2010
- 25. Once upon a time... Static pages Few resources Less javascript Saturday, May 8, 2010
- 26. Most time on server domain connect send receive render Saturday, May 8, 2010
- 27. Solution is faster serverside domain connect send receive render Saturday, May 8, 2010
- 28. Ajax revolution Saturday, May 8, 2010
- 29. Most time on browser domain connect send receive render Saturday, May 8, 2010
- 30. Golden rule of faster web 80% of the end user response time is spent on the front-end Saturday, May 8, 2010
- 31. Golden rule of faster web Start there. Saturday, May 8, 2010
- 32. Why web slow parts? Saturday, May 8, 2010
- 33. Easy to understand Saturday, May 8, 2010
- 34. Each part has its rules Saturday, May 8, 2010
- 35. Which parts are slow? Saturday, May 8, 2010
- 36. Network is slow Saturday, May 8, 2010
- 37. Less stuff Fewer requests Pages have too many resources Concatenate js/css Css sprites Less dns requests Saturday, May 8, 2010
- 38. Less stuff Cache requests Browser download resources repeatedly Expires header Revving Files External js/css Remove etags Saturday, May 8, 2010
- 39. Smaller stuff Compress responses Resources are too big Content-Encoding Gzip Deflate Saturday, May 8, 2010
- 40. Smaller stuff Minify responses Resources are too big js, css, html remove formatting remove comments use tools Saturday, May 8, 2010
- 41. Closer stuff Use a CDN Resources are too far reduce latency Saturday, May 8, 2010
- 42. Browser is slow Saturday, May 8, 2010
- 43. Scripts block loading html document.write javascript location.href css scripts order img javascript img flash Saturday, May 8, 2010
- 44. Put scripts at bottom html css img img flash javascript javascript Saturday, May 8, 2010
- 45. Unloaded styles block page rendering html img img flash css Saturday, May 8, 2010
- 46. Put styles at top html css img img flash Saturday, May 8, 2010
- 47. Scripts and styles side effects dom reflows css expression reflows Saturday, May 8, 2010
- 48. All that glitters is not gold Saturday, May 8, 2010
- 49. Everything is a tradeoff Saturday, May 8, 2010
- 50. performance brings complexity Saturday, May 8, 2010
- 51. know the rules but... Saturday, May 8, 2010
- 52. leave complexity to computers Saturday, May 8, 2010
- 53. use libraries during development Saturday, May 8, 2010
- 54. Use tools at build time Saturday, May 8, 2010
- 56. Questions? Saturday, May 8, 2010