Geee! Bandwith is hardly an issue here but CPU usage could be or maybe scripts that imposes a clog on the servers.
You can check all that through your CP:
CPU - you have to enable CPU usage reporting on your user account, then once a day I guess, a report is created.
I'm pretty sure but I could be wrong that you can't check it on the CP but it's accessible by FTP into your acc > logs > resources > yourDomain.sa.analyzed.0
Save $96 dollars when you sign up! -> 96DISCOUNT