Definite improvements in SU10 - currently in beta testing, to be released Aug 23.
There is a Developer Q&A video next Thurs on Twitch (MSFSOfficial) and they usually discuss exactly what changes have been made, and answer questions submitted. There is a lot of pressure (and momentum) to fix the performance issues on both PC and Xbox, whatever isn’t fixed in SU10 will start to be addressed in the subsequent updates, and so it goes.