CPU would be the Central Processing Unit, otherwise known as a processor in a computer and in essence, a server. Around here, CPU Time is what you should keep an eye out for. CPU time is the amount of time it takes for an operation to occur as if it were to use the entire amount of computing capacity available on the CPU. If for some reason you wind up consuming a large portion of CPU Time on the server, you may start to fall under our High Resource Usage policies.