Here is what you need to do to fix slow download speed in Microsoft Flight Simulator:
- If your Microsoft Flight Simulator 2020 is open, please exit the application.
- Open Start Menu and type “cmd”.
- Open “cmd.exe” with “Run as administrator” option.
- Type netsh int tcp set global autotuninglevel=normal and hit “Enter”. CMD should say Ok.
- Open your Microsoft Flight Simulator 2020 game and your download speed problem should be fixed now.