If you are experiencing low FPS in the Prepar3D Version of the MD-11 after climbing through FL200, please follow the steps below:
1) Navigate to the Aircraft.CFG.
2) Remove the following lines:
contrail = fx_MD-11_tail startup = MD-11_start WetEngineWash= fx_MD-11_nowash SnowEngineWash= fx_MD-11_nowash
3) Press Save.
If this does not solve your problem please let us know and we can help fix it!