Slides from a talk given at TrueNorthPHP 2013

1. PROFILING & OPTIMIZATION
Tools, guidelines, and techniques
Saturday, 9 November, 13

2. PERFORMANCE
Saturday, 9 November, 13

3. GETTING BUY-IN
Saturday, 9 November, 13

4. HIGHER CONVERSION RATES
Saturday, 9 November, 13

5. SLOW MOBILE
CONNECTIONS
Saturday, 9 November, 13

6. RULES; MORE LIKE
GUIDELINES
Saturday, 9 November, 13

7. Guideline
MEASURE EVERYTHING
Saturday, 9 November, 13

8. Guideline
HUNT THE BIG FISH
Saturday, 9 November, 13

9. Guideline
START CHEAP & ITERATE
Saturday, 9 November, 13

10. Cost Order
Minify assets
Compress images
Reduce number of HTTP requests
Optimize database queries
Add caching
Code optimization
Saturday, 9 November, 13

11. JUNK UP FRONT
Saturday, 9 November, 13

12. Junk Up Front
Saturday, 9 November, 13

13. Measuring
Chrome developer tools
Saturday, 9 November, 13

14. Junk up front
Number of requests
Number of hosts
Image count & image size
Script count & script size
Saturday, 9 November, 13

15. Fixing
Smushit (pngcrush, jpegtran, imagemagick)
Uglify.js, CSSMin
Make, phing, rake, grunt, shell scripts
Saturday, 9 November, 13

16. Image sprites
Easy way to reduce requests, and overall page size.
Data-URIs.
Icon WebFonts.
Saturday, 9 November, 13

17. Guideline
AVOID WORK TO GO FASTER
Saturday, 9 November, 13

18. WEBSERVER TRICKS
Saturday, 9 November, 13

19. Measuring
Chrome developer tools
Saturday, 9 November, 13

20. Webserver tricks
GZIP all the things.
Far Future cache headers.
Consider a CDN.
Saturday, 9 November, 13

21. SQL MOLASSES
Saturday, 9 November, 13

22. Database slowness
Many backend performance issues are caused by too many, or
slow queries.
Mysql has a pretty terrible query planner.
Sub-queries and derived table joins will eventually catch fire.
Slow query logs, mtop, or monitoring like new relic are your best
friend.
Saturday, 9 November, 13

23. Database slowness
Slow query logs - Percona makes great tools for MySQL.
Disable query caching.
Run EXPLAIN on slow queries.
Add indexes/tweak queries, and repeat.
Saturday, 9 November, 13

24. Explain Queries
Visual explain makes it easier.
Saturday, 9 November, 13

25. Indexes
Index commonly used columns.
Column order in matters in indexes.
Saturday, 9 November, 13

26. CACHING
Saturday, 9 November, 13

27. Caching
Can be expensive to rollout, if you need new infrastructure
Cache expiration is really really hard.
Saturday, 9 November, 13

28. What to Cache
Results that don’t change often
Use monitoring/analytics to find the busiest pages.
Start using caching there.
Expand once you’ve learned more.
Saturday, 9 November, 13

29. Where to cache
Hopefully in RAM
Failing that in shared memory
Disk :(
Saturday, 9 November, 13

30. Optimize cache use
Watch cache miss rate.
Tune cache expiration so you miss less often.
Saturday, 9 November, 13

31. Guideline
OPTIMIZE CODE LAST,
MOST OF THE TIME
Saturday, 9 November, 13

32. JAVASCRIPT
Saturday, 9 November, 13

33. PHP
Saturday, 9 November, 13

34. Javascript tools
Chrome dev tools are the gold standard.
CPU profiles are invaluable.
Heap comparisons can be used to find memory leaks.
Saturday, 9 November, 13

35. CPU Profiler
Chrome dev tools
Saturday, 9 November, 13

36. CPU Profiler
Chrome dev tools
Saturday, 9 November, 13

37. CPU Profiler
Chrome dev tools
Saturday, 9 November, 13

38. CPU Profiler
Chrome dev tools
Saturday, 9 November, 13

39. PHP TOOLS
Saturday, 9 November, 13

40. XHProf
PECL extension produced by Facebook.
Captures runtime metrics at a function level.
Possible to use in a sub-sample of production unlike xdebug.
Saturday, 9 November, 13

41. Xhgui
Nicer UI to XHProf data
Saturday, 9 November, 13

42. Xhgui
Nicer UI to XHProf data
Saturday, 9 November, 13

43. XDebug
Not suitable for servers with traffic,
Very detailed results.
Saturday, 9 November, 13

44. Webgrind
XDebug UI
Saturday, 9 November, 13

45. Other PHP tweaks
Opcode caching is a must.
Don’t use file based sessions.
Saturday, 9 November, 13

46. RECAP
Saturday, 9 November, 13

47. MEASURE EVERYTHING
Saturday, 9 November, 13

48. BE THRIFTY
Saturday, 9 November, 13

49. START IN THE FRONT
Saturday, 9 November, 13

50. AVOID WORK
Saturday, 9 November, 13

51. OPTIMIZE CODE
Saturday, 9 November, 13

52. THANKS
Saturday, 9 November, 13

53. Thanks
mark_story on Twitter.
markstory on Github.
Rate this talk: https://joind.in/9994
Saturday, 9 November, 13