1.
PROFILING & OPTIMIZATION
Tools, guidelines, and techniques
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2.
PERFORMANCE
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3.
GETTING BUY-IN
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4.
HIGHER CONVERSION RATES
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5.
SLOW MOBILE
CONNECTIONS
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6.
RULES; MORE LIKE
GUIDELINES
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7.
Guideline
MEASURE EVERYTHING
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8.
Guideline
HUNT THE BIG FISH
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9.
Guideline
START CHEAP & ITERATE
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10.
Cost Order
Minify assets
Compress images
Reduce number of HTTP requests
Optimize database queries
Add caching
Code optimization
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11.
JUNK UP FRONT
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12.
Junk Up Front
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13.
Measuring
Chrome developer tools
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14.
Junk up front
Number of requests
Number of hosts
Image count & image size
Script count & script size
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15.
Fixing
Smushit (pngcrush, jpegtran, imagemagick)
Uglify.js, CSSMin
Make, phing, rake, grunt, shell scripts
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16.
Image sprites
Easy way to reduce requests, and overall page size.
Data-URIs.
Icon WebFonts.
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17.
Guideline
AVOID WORK TO GO FASTER
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18.
WEBSERVER TRICKS
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19.
Measuring
Chrome developer tools
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20.
Webserver tricks
GZIP all the things.
Far Future cache headers.
Consider a CDN.
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21.
SQL MOLASSES
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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.
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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.
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24.
Explain Queries
Visual explain makes it easier.
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25.
Indexes
Index commonly used columns.
Column order in matters in indexes.
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26.
CACHING
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27.
Caching
Can be expensive to rollout, if you need new infrastructure
Cache expiration is really really hard.
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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.
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29.
Where to cache
Hopefully in RAM
Failing that in shared memory
Disk :(
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30.
Optimize cache use
Watch cache miss rate.
Tune cache expiration so you miss less often.
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31.
Guideline
OPTIMIZE CODE LAST,
MOST OF THE TIME
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32.
JAVASCRIPT
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33.
PHP
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34.
Javascript tools
Chrome dev tools are the gold standard.
CPU profiles are invaluable.
Heap comparisons can be used to find memory leaks.
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35.
CPU Profiler
Chrome dev tools
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36.
CPU Profiler
Chrome dev tools
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37.
CPU Profiler
Chrome dev tools
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38.
CPU Profiler
Chrome dev tools
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39.
PHP TOOLS
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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.
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41.
Xhgui
Nicer UI to XHProf data
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42.
Xhgui
Nicer UI to XHProf data
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43.
XDebug
Not suitable for servers with traffic,
Very detailed results.
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44.
Webgrind
XDebug UI
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45.
Other PHP tweaks
Opcode caching is a must.
Don’t use file based sessions.
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46.
RECAP
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47.
MEASURE EVERYTHING
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48.
BE THRIFTY
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49.
START IN THE FRONT
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50.
AVOID WORK
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51.
OPTIMIZE CODE
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52.
THANKS
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53.
Thanks
mark_story on Twitter.
markstory on Github.
Rate this talk: https://joind.in/9994
Saturday, 9 November, 13