Suspending account that is high system resourse usage

[-emhz-]

How will I know I'm using high system resource? Im using prestashop with few test products and I got suspended with this reasons:

You have been suspended for high system resource usage. Accounts are suspended for usage when they are detected to have consistently high cpu usage, memory usage, or process amounts. This is an automa.

But anyway I am already unsuspended but I want to know... what precaution I need to do so that my account would not be suspended with these reasons?