Ensure that the 4GB patch is installed:
- Download the 4GB patch here.
- Unpack the .zip file with Winzip/WinRar
- Open 4gb_patch.exe
- Locate the OMSI.exe in the OMSI installation directory (usually C:/Program Files(x86)/Steam/steamapps/common/OMSI 2)
- Select the OMSI.exe and confirm with Open
Select the lowest possible settings
Setting the lowest possible settings for the map may help performance. This can be done in OMSI Options -> Load Options.
Install OMSi on a SSD
If possible, move OMSI to an SSD. SSDs generally improve loading times and loading performance.