Can I substitute a new router to check the speed of my existing router without upsetting it's settings

[peripathetic]

[ChuckFickens]

Yes, the router you are using at the moment will remember it's settings, the new router will need to be setup with your username and password for your broadband

[peripathetic]

Thank you Chuck 'IT God & Lord of the Cyber Wave' Fickens - as I appear to have sent virtually the same question twice am considering changing my UserName from Peripathetic to Completelypathetic
I,m getting nowhere in finding out why my download speed on a nominal 8Mgb contract is dropping to 0.3Mgb. BT claim that my exchange should handle a maximum of 3Mgb. My ISP is virtually unobtainable - very different to when they wanted me to sign up. Any thoughts/help would be truly appreciated. Mac based setup.