Nmap issues...? or router?

["bluefur0r bluefur0r" <bluefur0r () drea ms>]

After just completeing an audit for a company that has a DS-3 connection (shared) and a cisco router (2015), One of the 
first issues that was found was this: When nmaping using -sS and all ports, 1 nmap scan nmaping 1 host at a time 
appeared to completely destroy their bandwidth... Has anyone heard of this? Could this be a Router or ISP problem??? It 
took very long to complete because i needed to use the -T Polite option. I'm just curious if anyone else has ever 
encountered nmap using up all network resources for such a high volume connection. Any help would be appreciated so 
this never happens again. *Luckily I started after hours*
blue

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