LOL the speed tests that post MS data are more accurate for gaming.
There was a specific problem between two of the large trunks from Georgia to West Virginia one time. Although I still tested as getting as good or better than my advertised UP/DOWN, my latency was terrible. I pinged over 1000ms to Texas, where I usually ping in the mid 30s.
This is where those criminals try to get you. They guarantee 3MB, or whatever, but don't guarantee latency.