So this mainly happens on the Koln-Aachem route but it has also happened on the Bakerloo line, but whenever I've finished a service, train sim world 2 takes ages to load the performance statistics... I've once had to wait 5 minutes after operating a RE9 service to Koln in timetable mode, and it also once crashed after driving an ICE to Aachen. Is there a fix for this issue?
I have notice this as well - i79750H, 8GB Ram, GTX 1660 TI 6GB, although my times are not as pronounces as what the OP has reported, this is a noticeable amount of time compared to TSW2020.