W3 Total Cache

W3 Total Cache (W3TC) improves the SEO and user experience of your site by increasing website performance and reducing load times by leveraging features like content delivery network (CDN) integration and the latest best practices.

BENEFITS

  • Improvements in search engine result page rankings, especially for mobile-friendly websites and sites that use SSL
  • At least 10x improvement in overall site performance (Grade A in WebPagetest or significant Google Page Speed improvements) when fully configured
  • Improved conversion rates and “site performance” which affect your site’s rank on Google.com
  • “Instant” repeat page views: browser caching
  • Optimized progressive render: pages start rendering quickly and can be interacted with more quickly
  • Reduced page load time: increased visitor time on site; visitors view more pages
  • Improved web server performance; sustain high traffic periods
  • Up to 80% bandwidth savings when you minify HTML, minify CSS and minify JS files.

1+ million active users, last updated 12pm, Feb 18 (as of Feb 18, 7pm).

4.5 stars, many claim it is useful and helpful while a few people claimed it was a bit confusing.

I think this is a helpful plugin and may help my site.