My lightning talk on things you can do to figure out what's slowing down your WordPress site.

1. Glacial Profiling
Figu ri ng ou t w h y you r web si te is sl o w

2. Obvious things
Web page size ( > 1MB?)
External calls on end user (facebook, twitter,
ads)
External calls on page load

3. External Calls on user
http://tools.pingdom.com
http://www.webpagetest.org
pagespeed extension
https://developers.google.com/pagespeed/

4. Tools to Speed things up
Rackspace Cloud Files CDN
MaxCDN - Pull Zone CDN (easiest to implement)
Torbit - Dynamic HTML optimization
Cloudflare

5. Profiling on the Backend
Debugging PHP
Xdebug
Xhprof
New Relic

6. WordPress Calls

7. More Profiling

8. Client friendly map

9. Other obvious things
MySQL Slow Query log
Turn it off when you’re done debugging
In development mode turn on log queries that
don’t use an index.
Notices and warnings
Write clean code, don’t just surpress errors.