i found out a funny idea myself after changing my CPU from 5600x to 9800x3d, so called "stuttering" problems improved a lot. like, over >1s of "beeep" moment changed into <0.5s of "bip". and this is in my acceptable range but still, stutterings of initial drive after installation of routes and update of graphic driver remains. (as far as what i have learned from this forum) so i was driving Frankfurt to Fulda as RE50, and i quickly realized that this is my initial drive of this line after updating GPU driver. tons of shader gathering moments. so i quit playing and thinking of drive this line with ICE3 first. then this idea came up. no speed limit, no AI train, no red signal, 300kph with, such as TGV-driving mode only for shader gathering. no need to suffer for 160kph speed limits and one and a half hour of initial drive. then, like, "ok only enduring 30 mins then i can play this route without any problems" what do you guys think of this? this idea consists of half nonsense, but half seriousness. as far as i think.