I have 10mbps service through Roadrunner, and 10mbps Max Internet through U-verse.

At 6pm, my U-verse speeds drop down to 1.5mbps or less to many hosts like Microsoft and Apple (and countless others I've tried).   Some routes DO continue to work fast, though.

At 6pm, my Road Runner connection runs at full speed.

My RG shows not a single uncorrected error, and my TV service works perfectly.  There is no local issue with my line. 

I am trying to work with U-verse support to see if they can find better routing for me but I kinda doubt it will happen.   It's looking like I'm going to have to keep Road Runner if I want consistently fast internet service. 

So much for that whole shared bandwidth theory.