Delay is an QoS (Quality of Service) parameter which has effect on almost every service provided by Internet connection. Every network element increases delay because of the need of handling data. The introduction presents an optimization process performed on MikroTik device, using Mangle and Queue tools. This optimization has positive effect on this important parameter. In last part of this work is shown that positive effect on delay is obvious as the transmission speed has raised up, after optimization process has been applied.