I have done a complete uninstall / reinstall of MSFS2020, standard MS Store version, no add ons . I am running latest Win 10 on an I7 11700K processer with 32Gb Ram. MSFS is on the system drive Samsung Pro SSD NVMe, 5000Mb/s avg speed.
MSFS takes about 3 1/2 minutes to ready to fly point. I would like to reduce that. I have tried the fast launch command but all it does is give me a dialog box that says “game is already running”.
That worked. All the other cmd command lines posted on line did not work. Although, it only stopped the developers spalsh screens, not all the extras that MS tells you are in the game, like bespoke airports, world maps, etc. I don’t know if those can be stopped from displaying.
In my case it made a 26 second difference, 2:19 vs 2:45. Is it worth it, probably not. Although it is worth it to get rid of the annoying start up logos, associated sounds and copyright notice.