I don't understand, I love radar.weather.gov. It's fast, works extremely well, lets me zoom in on an area even as it's animating, works great on Windows, Linux, Chrome on Android, what's not to like?
The gif for an area covering a 2 hour drive in any direction loads in about a quarter second.
I probably got a little soured on it when they made it the primary path from forecast pages at a time when it was still quite slow.