that’s correct… I have pagefile setting 1Gig Min and 4Gig Max. Windows never increase that ( note: never disable pagefile completly 
).
And possible because of this I see no diff in cache on/off.
this is not an issue … a lot more show you that you need more RAM 
( see also : How many CTDs do you have per number of Flights? Lets compare? - #130 by MichaMMA )
Memory Compressing is like Defrag … this also happens with the memory and it becomes more worst as you use “all” of your RAM.
For MSFS we can only recommend to buy 32Gig RAM,… at least
If Windows must use the pagefile, the issues starts ( and this is allways the case with 16Gig RAM ). Then addtional comes the Cache-File…
What user can try , and it is a old tip from ages where no HDD exists : set a FIXED pagefile size ( e.g Min/Max:30 ).