Unfortunately the Wordfence “Live Visitor Tracking” feature can cause CPU usage issues for websites. Therefore, I recommend you disable this feature to improve the performance of your WordPress website.
You can tune your WordPress blog speed and performance by setting a correct WP_MEMORY_LIMIT in your wp-config.php file. Here is how:
WordPress updates, like Core-, plugin- and themes, sometimes fail because of enabled PHP opcode caches. Popular PHP opcode caches are OPcache, WinCache and APC. Flushing these opcode caches first eases the WordPress update process. And here is a Must Use Plugin to flush OPcache cache …
Currently, Vanilla-WP runs with WP-Super-Cache enabled, and my abandoned Database Cache disabled. The fun part of WP-Super-Cache as caching plugin is, it allows the usage of plugins. Yes, a plugin for a plugin 🙂 . One of those plugins is WPSCMin, by Joel Hardi.
Optimize WordPress MySQL tables through Cron, behind the scenes provides and describes a plugin to regularly optimize your MySQL database tables, to improve WordPress performance.