Loss of power ever stronger in the K4M

I think my little Megane III is slowly getting weak on the chest. The loss of power in the warm state is getting worse. When the engine is cold it pulls neatly. However, as soon as the engine gets warm, I am only on the switch. In the 5th at 60 km/h still something to speed up is almost impossible. If I latch there fully on the gas he can possibly get a KM/H per second more. In the 6th he can only keep the 60 km/h with connected limiter. I ch first thought that the clutch is now finally through, but also the speed does not rise even though it reacts loudly, when I give gas… Even in urban traffic I have to switch to the 3rd to overtake such a 45kmh Schleicher… On the track it hardly gets over 150kmh. The car was always a little weak. The megane of the workmate with the same engine goes there clearly more splashy. Has someone here perhaps already experienced the same thing? Are these the last twitches u nd should therefore repel the car as soon as possible or is there still hope? The current consumption when accelerating goes loosely up to 19l and while swimming with the 6th at about 5l. 1.6 16v 110ps Thank you for the answers, if any come.