The question is, how to delete them easily, because their name is not identical with their filename. The content-manger offers no option to delete files.
An other question is: does FS2020 starts faster, when the number of entries in the contentmanager is lower.
For understanding: a start of FS2020 via steam takes me up to 10-15 minutes, whereas starting my other flightsim "Aerosoft2", also via steam takes 30 seconds only.
About my PC: CPU is a Ryzen7 3700X, 64GB Ram (DDR4 3200), GRAKA is NVIDIA GTX1070, (8GB RAM) Internet is 100Mbit/s