@sweetpi Many thanks for the answer.
I’ll test OneWire branch for DS18B20. I hope my 433mhz receiving is not affected.
My permanet increase CPU activity associated with DS18B20 was just a guess. It occurred at the same time. Currently I have connected all five sensors DS18B20. The CPU activity increases nevertheless permanent. After restarting the RPi CPU load is around 20%. (Before the problem there were about 3-6%), then the load continues to rise. In relation memory usage rising also. Until pimatic goodbye.