Question : QoS config

A few users have an app that communicates data over our internet connection all day long. If our connection gets saturated, the data they need gets delayed and causes big problems. I want to setup QoS to always give priority to packets sent to and received from a certain IP address. Before we discuss any config, would this be better to setup on the internet router (cisco 3745) or the firewall (ASA 5520)? Does it even matter?

Answer : QoS config

reason is simple ,
what ever the QOS configuration you do on the firewall  will not be much effective coz your internet connection doesn't have 100Mbps or 1000 Mbps spped . isn;t ?