Speed persists when switching

Hello, actually I come from the VW warehouse and have absolutely no experience with Renault. I have never owned one myself, but my parents have now bought a Megane as part of the scrapping premium, because their old golf was scrapped. I borrowed the Megane the days and was quite horrified by the clutch. At first I noticed the crazy long pedal path. Besides, the clutch only packs at the very last moment. That means that you leave the clutch sp edal felt good 10 cm come and only the clutch reaches the last 2 cm. Then I noticed that the engine speed remains when pedaling the clutch for a short time (1-2 seconds), until it drops to idle speed. I have been driving cars for 25 years now, most of the time with manual gearbox. I have never experienced this before. If I want to switch, I have to go completely off the gas until two counts and then kick the clutch pedal. Otherwise, the clutch pedal is crying. even if I am in the first gear and let go of the accelerator at high speed, the megane rolls further, as if it had not been. In other vehicles, the motor brake would immediately become noticeable. Not with the megane of my parents. Here it is said when switching: wait down from the gas > two seconds > clutch step > switching > completely let the clutch come > give gas. I find this not only extremely unusual, but also un or is this some new technology from Renault that was not explained to us at the time of delivery? PS. The SuFu was no help for me. Greetings Tom