Getting the most out of DCS Multithreading

Deleting the contents of C:\Users\Username\Saved Games\DCS" fxo and metashaders2 folders after the MT update seemed to have helped a bit...

Someone on the DCS forums also recommended this to others who are having stuttering after MT
what are all of the letter/number combos in the fxo and metashaders2 folders? How does it impact the sim if they are removed?