Here are some things to do to get rid of the extra work
Memory Compression in Windows 10 | High CPU Usage [SOLVED] (silicophilic.com)
But I think this is sufficient
Open Windows Powershell (type powershell in the search box) and enter this command
Disable-MMAgent -mc
Disable-MMAgent (MMAgent) | Microsoft Docs
To see if it works, you should no longer have and compressed memory visible in the memory pane of task manager, where it says In Use (Compressed)
FS2020 doesn’t take all it can get but it does take a lot. I’m usually at around 20GB ram allocated over cities and still have 10GB free. It used to take the same amount when I had 16GB ram, causing heavy pagefile use and a lot of stuttering.
There is also a memory bug still present in FS2020 where the sim can fall behind and keep allocating more and more memory working on more and more tiles, including those that are out of range already. I’ve seen memory use go up to 41GB before it gave up and crashed. Although at 30GB in use my fps is already so compromised I have to pause, set terrain detail to 10 and let it recover. (Slowly falls back to between 14 and 16GB in use, then terrain detail back to 100)