From DTG 3/2/2021
Today, we are bringing a core update for Train Simulator 2021 that includes optimisation and loading performance improvements aimed at addressing long load times experienced by players when loading content that is contained within asset package files (.ap).
This update has been tested vigorously but, given the vast scale of the Add-on catalogue, User Generated Content (UGC) and the Third-Party Add-on catalogue (non-Steam), it is entirely impossible to test every possible combination. We are, therefore, making these improvements available as an "opt-in" update. This means, to utilise the benefits of this update, you will need to do some additional steps as explained below
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To use this update, please follow the steps below:
1. Open Steam and navigate to your Steam Games Library.
2. Locate and right-click on Train Simulator.
3. Select Properties from the context menu to view Train Simulator's Properties Dialog.
4. In the General Tab, scroll down until you see Launch Options.
5. Click in the text entry box and type (see image below): -fastload
6. Close Train Simulator's Properties Dialog to save your changes.
Please note: If you use a desktop shortcut to launch Train Simulator, you will need to also add the above launch option to the shortcut. Launch options only work when clicking Play in Steam and, if they are not also added to your shortcut, you will not see any difference. To add the launch option to your desktop shortcut, follow the steps below:
1. Right-click on your desktop shortcut and select Properties.
2. In the properties dialog, click the Shortcut tab.
3. Locate and click in the Target text box.
4. Scroll to the end of the text, add a space then type: -fastload
5. Click Apply, then OK to save the changes.
If you have issues simply undo the previous steps.
Full Text here:
https://forums.dovetailgames.com/thread ... 021.36321/