Some CDG controllers seem to think their lives depend on how many words per minute they can speak
That may be so but that's exactly how I describe the majority of ATCOs in the USA. But, the locals don't seem to have a problem with it. It's all down to being more in tune with one's native language no matter at which speed the delivery is made. However, some ATCOs just do not grasp the need to slow down and make the effort to be clearer when speaking to non natives. Just here, locally in The Netherlands (no, not Amsterdam), I was the other day astounded at the speed of delivery and lack of clarity by a Dutch ATCO with an Chinese crew. I lost count of the number of "say again" requests by the crew! Not even a busy airport.