Norton and Win 10 on a new computer, my internet pages REALLY slow

I bought a new Dell Computer and put Norton 360 on it.  Around the same time, I also got the email to upgrade to Windows 10. so I did that.  Now my internet pages are loading RIDICULOUSLY slow.  My cable/internet provider confirmed that we are on high speed road runner and there are no internet issues from their end. Someone suggested Norton was probably slowing me down, but I don't know how to determine that or what to do.  When I say my pages are loading slow, I mean SLOW, sometimes 5 or more minutes just to load a single page.