I first heard the "High speed call" phenomenon when dealing with artillery. It is tempting for young players to confuse speed of delivery with efficiency and professionalism and that was what was happening. I hear it sometimes when flying, almost always on CTAF frequencies. I don't think I've ever heard this behaviour on area frequencies the jet pilots are certainly brief, but never hurried to the point of unintelligibility. In fact its good education to listen on Area for a while.
It's important to think about speed of comprehension, not speed of delivery.