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The jargon in the community for speaking really fast to win] is “spreading” and it was a dominant strategy by the late 1990s. Serious debaters expect to learn to read, listen, and talk that fast. There is widespread acknowledgement that it is tactical, and many sniff “against the purpose of debate” (while speaking at 200+ words per minute), but debate is a sport like football is a sport and if you want to play football without running or losing to people better at running than you, you may be selecting for a high friction lifestyle.
(There are several debate communities with some overlap, given that there are several styles of debate with different rulesets, organizations, and microcultures about performance. At least when I was doing it in 2000-2004, spreading was hegemonic in Policy debate and less effective (and beatable) in Parliamentary debate.)
Spreading is not intelligible to the layperson, and to the extent to which debate is about presenting ideas in a way that convinces a layperson, it is a failure. But there really is only so much that one can say in short 6 minute speech times. Talking faster, provided people can follow what is happening/read quickly, allows oftentimes for a more in-depth discussion than what was previously possible.