here now the requested informations about pagefile, which are more up2date.
From the official MSFS FAQ:
INCREASE THE VIRTUAL MEMORY (PAGEFILE) ON YOUR SYSTEM (ALL VERSIONS)
- In the Windows Seach bar, type Advanced system settings and open the Control Panel.
- Make sure you’re on the Advanced tab.
- Click the Settings button from under the Performance
- On the Performance Options box, go to the Advanced tab > Performance
- Click on Settings
- On the Virtual Memory box, uncheck the Automatically manage paging file size for all drives
- Click to select the drive on which Windows 10 is installed (by default C:)
- Click to select the Custom size radio button.
- In the now-enabled fields, type the minimum and maximum size of the Pagefile in megabytes (MB) according to the physical memory present in your computer.
- Click Set and then click OK.
- Restart your computer.
And intressting topics about the pagefile, example
And related to the OP, which own 64GIG RAM, exist also a good topic: