Scanning our logs on your account further, it seems that the majority of the usage is coming from your WordPress installation. We suggest that you optimize the software to run as efficiently as possible to use the least amount of resources. Since you are using WordPress, I suggest visiting these following URLs for more information on how to optimize your WordPress installation:
Some general tips for optimizing WordPress are as follows:
1. Optimize the database. Often times, a database will become fragmented or bloated. You can use the “Optimize” function in PhpMyAdmin to optimize your tables. This will help reduce overhead on the database and increase performance.
2. Uninstall/disable any unnecessary plugins on the site. The more plugins you have enabled, the more resources a WordPress site will use. Also, some plugins do not play well together, or are simply poorly optimized and use more resources than they should.
3. Installing a caching plugin. There are several options for this such as, WP Super Cache, W3 Total Cache, Hyper Cache Extended, DB Cache Cache Reloaded, and so on. Caching reduces how often the same files need to be accessed, and caching queries can reduce how much your site needs to query the database. All of these, especially the database caching, can help to lower your resource usage on the server.
4. Sometimes the theme itself on a site can cause the resource usage to increase. If you are using a 3rd party theme, you may wish to see if there are any updates for it. If your theme is custom, then perhaps make sure it’s as optimized as it can be.
5. Install one or both of the following plugins in order to help identify the most resource intensive plugins installed under your site, as well as gaining the ability to control WordPress cron jobs since many performance issues with WordPress are a result of constant execution of the wp-cron.php script.
Once WordPress has been optimized, your site should be running much more efficiently and you should being using less system resources. Please let us know if you have any questions.