I am the Debate coach at Tift County High School.
I am fine with speed, but you should not speak so quickly that it interferes with comprehension.
Making sure your points are understood is a key element of speech.
I will score substance over style. I can understand debate jargon, but if you're using it to an extent that it is confusing your opponents or seems counter-productive to clear communication, I will not appreciate it.
There should be an exchange of ideas present. If you are debating air, so to speak -- that is to say not actually engaging with your opponents' rhetoric -- you will not be rewarded.

I am an AP Lang teacher and am a stickler for logical fallacies and effective rhetoric. The former will lead to deductions while the latter will, of course, be rewarded. Just because your opponent was not able to expose fallacious reasoning, does not mean that I will give you credit for it.