The CPU usage involves the Central Processing Unit(s) of the web server where your account is hosted on.

Each hosting account has a CPU usage limit, which, when reached, may result in the account being suspended.

You can monitor the CPU usage stats for your hosting account at any given moment from the Statistics -> CPU Stats section of your Control Panel.

You can compare the current CPU usage with the allowed limit for your account, which you can see in the Account Usage table (located on the left side of your Control Panel).

To reduce the CPU usage of your account, there are several general rules you should follow:

• Upgrade all third-party web applications to the latest stable release available (Joomla, WordPress and any other content management or blog systems, forums, galleries or any other scripts that you have installed)
• If any of the web applications that you use have addons or plugins, make sure they are upgraded to the latest availble versions as well
• Remove any unused web applications and/or plugins/addons that you have installed
• Activate caching for any web applications that you use that have this option
• If you have developed your script(s) yourself, try reducing the number of MySQL/PostgreSQL queries and optimize your scripts to use less processing time.

If you need to deal with a high CPU usage problem and reduce the CPU usage, you must first identify the reasons for the high CPU usage.

Unfortunately, this is often quite difficult, especially if you are using third-party web applications such as forums, content management or blog systems, etc. that you have not developed yourself and have little or no knowledge at all about their inner working.

Here are a few recommendations you could consider to get an idea where to start from:

1. Identify the website that is most likely to be responsible for the high CPU usage.
   If you host more than one website (domain/subdomain) in your account, start by identifying which one is most visited and which one generates most traffic – this is probably the one that’s responsible for the high CPU usage. Go to the Statistics > Traffic Stats section and find out which of your hosts (domains or subdomains) has generated the most traffic for the past day and for the current month.
2. Identify the file that is most likely responsible for the high CPU usage (if any).
   Once you have established which website has generated the most traffic by visiting the Statistics menu, go to the Statistics > Traffic Stats section of your Control Panel and view the traffic stats for this domain/subdomain for the current month. Look for the file(s) that have generated most traffic – you can find them in the Top 10 of XX Total URLs By KBytes table. Look for any PHP/CGI files in this list that have generated unusually large amounts of traffic. This file(s) is most likely the reason for the high CPU usage and you should consider optimizing it.
3. Identify the visitor/bot that is most likely responsible for the high CPU usage (if any).
   Like in step 2, look at the monthly traffic stats for your domain/subdomain and look for the visitor/host that has generated most traffic this month. You will find the list under Top 10 of XX Total Sites By KBytes – look for any hosts that have generated unusually large amounts of traffic (compared to the rest) – it would either be an IP address or a hostname of the kind botname.some-domain.com. You may want to block the access of this host(s) or at least restrict it to reduce the CPU usage of your account.

If you are still unable to reduce the CPU usage of your account, you should either look for the help of a professional developer or simply consider a either a dedicated server or at least a VPS or a semi-dedicated server.