I use to get this, enabling FastLaunch fixed it for me.
SKIP THE INTRO
-
Microsoft Store version
- Close Microsoft Flight Simulator
- In the Windows search bar type Powershell
- Select Run as administrator
- In the pop-up window that appears, copy-paste the following command
- cmd.exe /C start shell:AppsFolder\Microsoft.FlightSimulator_8wekyb3d8bbwe!App -FastLaunch
- If prompted, authorize the program to run.
-
Steam
- Close Microsoft Flight Simulator
- Open your Steam Library
- Right-click on Microsoft Flight Simulator > Properties.
- On the General tab you’ll find Launch Options section.
- Enter the launch option:
- -FastLaunch
I hope that helps.