I have been playing Train Simulator/Rail Simulator for over ten years. No matter what I do, I cannot eliminate occasional stuttering and instantaneous freezing. After four rebuilds, this is what I have: 64bit Windows 10 PRO Mother board: Asus P8Z77-M CPU: I7-3770K @350 GHz RAM:16 GB DDR3 Video: GeForce GTX 1080 w/8GB GDDR5X SSD: Samsung 840 PRO 2nd SSD: M.2 NVMe Samsung 1T 970EVO. (Train Sim library folders were transferred to this drive using the Steam multiple drive utility.) Transferring the Train Sim library to the NVMe ssd has given me some improvement, I think due to the speed of this ssd. I'm not good at tweaking. Does anyone have any ideas? Am I missing something?