Cox Arizona and YouTube

Dear Cox,

Either you're purposefully throttling YouTube, or your local YouTube content cache / distribution point is horrifically under-powered. YouTube videos on all devices connected through Cox stream only at the lowest possible resolution, and even then it takes 5 to 10 minutes to get through a 30-second video. I wish that was an exaggeration. It's not. This problem is persistent over the past several weeks at least, though varies by time-of-day.

And I know with 100% certainty that the problem is, in fact, Cox, and specifically Cox's connection and local cache of YouTube, because when I connect directly to YouTube from Cox, the connection is terrible. But if instead I tunnel my traffic from Cox here in Arizona to a personal server in Texas or Atlanta or New York or London, and then back to YouTube, HD videos play at full speed with no issues at all (over the SAME cable connection). I can stream even Ultra-HD 4K content from YouTube as long as Cox doesn't know it's coming from YouTube.

So, to recap:
Cox Cable Arizona -> Youtube   -- Telegraph-era Slow
Cox Cable Arizona -> New York  -> YouTube  -- Blazing Fast

In case this is not terribly clear. DEAR COX: YOU ARE CAUSING THIS TROUBLE. STOP BREAKING THE INTERNET.