Tested only in WP 3.12
Tools
- CloudFlare.com and its plugin (cloud DNS)
- imsanity (reduce image file size)
- Smush.it plugin (reduce image file size)
- W3 Total Cache or Super Cache plugin (caching but database caching can slow down site by 3seconds)
- Autoptimize plugin (caching)
- WP Plugin Organizer (selective loading of plugins)
Tests
- http://www.site24x7.com/web-page-analyzer.html
- http://rapid.searchmetrics.com/en/seo-tools/site-analysis/
- http://analyze.websiteoptimization.com/wso
- http://tools.pingdom.com/