How to add a delay in SUMO GUI?

A delay in SUMO GUI is slow down in simulation between two simulation steps for a given number of milliseconds.

Follow the steps given below to introduce a delay in SUMO GUI at the time of launching the simulation environment.

Create a file for settings (E.g., file.settings.xml) and add the following content. Mention the preferred value for delay.

Give reference to settings file in SUMO configuration file. (E.g., file.sumocfg) as given below.

References: 
[1] http://sumo.dlr.de/wiki/Tutorials/Hello_Sumo

[2] http://www.sumo.dlr.de/userdoc/SUMO.html