Between the two my MSFS 2020 performance increased considerably.
 
For some reason my cross country Bush flights became corrupted. The flight plans would not show and no credit was given even if you landed at the appropriate airport. So, I reinstalled MSFS 2020 after having installed 456.55 and my Airbus fps went from mid 20's to 50-60's and the Bush flights improved from 50-70's to 90's and at times into the 100's. All this at Ultra settings.
 
The current MSFS version is 1.9.3. For some reason W10 (2004) doesnt work well with MSFS but after reinstalling MSFS the performance is great. If you have W10 (2004) and not on version MSFS 1.9.3 I would recommend a complete reinstall. If you do there will be some issues with downloading all the content of MSFS 2020 where you have to go into Content Manager to download the rest of the content.
 
Cant believe how much better a reinstall of FS and the new GPU driver work together.
 
https://flightsimulator.zendesk.com/hc/en-us/articles/360015946980-Missing-Deluxe-or-Deluxe-Premium-DLC-content-Microsoft-Store-
 
 
https://flightsimulator.zendesk.com/hc/en-us/articles/360016763120-Only-2-aircraft-in-the-hangar-How-to-install-additional-content-when-using-a-custom-installation-folder-
 
https://flightsimulator.zendesk.com/hc/en-us/articles/360016027399-KNOWN-ISSUES-Last-modified-Sept-29-2020-
 
https://flightsimulator.zendesk.com/hc/en-us/articles/360016107019