Very strange. I wonder if the 4G is overwhelmed with lack of support and growing too fast, with too many 4G users?
Similar to the AT&T / iphone affect that people experienced in major cities. If that's the case, I wouldn't be too worried just yet, since it's still growing and I have faith in Verizon's good call / data quality. They won't half-@ss it.
That doesn't explain the Wifi being slower though, there's no explanation for that.