Well it depends. Technically speaking, it’s around twice as fast as standard speed on highway (at least in France, so 130kmh). In terms of feelings, it’s probably not that faster? I never went above 140 or so but from my experience, your brain adapts to the speed, so if you got to 300 not that suddenly it probably does not feel like twice as fast than the usual. In terms of safety, it may be more than twice the danger. I’m no expert, but depending on the vehicle and how many other vehicles there are on the highway, it could be very dangerous.
I observe this too. My generation of friends met in school at first, but as we got older and went to work, meeting someone new became more rare. I saw a lot of my friends starting dating each other in our high-school group of friends years after we left highschool, probably because it was easier than to meet random people. It’s a bit weird though, and most relationships ended rapidly or badly.
So when work and old school friends are no option, and you have no place to make new friends, it does feel logical to turn to online dating.