Wireless Router - WPS Pin?

I am moving back to a mac from years on a windows machine. My new imac works perfectly though my wireless internet connection seems a bit slow. My old Dell laptop definitely has a faster connection on the same wireless router.

The imac immediately connected to my network. My windows machine needed the WPS pin from the bottom of the router. Could this be causing the speed difference? If not, where else should I look?

thanks for the assistance
Scott