Is SSD only for fast launch?

Hi everyone,
Sorry if this has been asked before, I looked for it and I read couple of replies in different topics that SSD only matters for fast launch of the game.
I had to reinstall MSFS to my HDD, because SSD was running out of space, I’m just curious if it makes any affect on the performance ?
I’ll also share my findings right after the installation is done.
Thanks a lot !

There is no change in the performance at all. Just in case anyone is wondering, also didn’t notice any significant loading time difference either.

MSFS game files run from ram so once loaded performance shouldn’t be affected however you really don’t wan’t your scenery on HDD especially over time as it gradually gets fragmented.

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I would think you would want the rolling cache to be on an SSD if one used the cache at all. I can’t imagine an HDD being fast enough.

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speed of HDD is also sufficent for the rolling.cache… But the sum of all read/write can be a problem for a HDD… there is just a physical read/write-head which must move around the data.
Mainly it is what @MuTe0794 assumed, the loading time is possible increadable slow and may be loading of scenery data in-flight can be affected too. But the performance in general, in special if enough RAM exist, depends on CPU/Memory/GPU. In worst case some stutters can occurs because data can not fast enough loaded, but I assume in-fligh should 100MByte/s transfer-speed sufficent enough.

My recommendation for the @MuTe0794 : dont put a pagefile on that hdd , use the HDD exclusivly for MSFS. Of course, if you can, follow the hint from @mbraortns and not put the rolling.cache on the hdd ( PS: I use since long while no longer rolling.cache or only max 2gig. )

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Just to give you guys an update. You were definitely right. I did couple of flights, and after some time, it had hard time to display the ground data with true resolution, so it seemed like I had the online funcitonalities off completely, and I was trying the weather just for testing purposes, when I switched from offline to online weather, I guess I waited a minute the weather to be correctly displayed.
So I removed msfs from hdd and I’m now reinstalling to ssd. I just thought I’d give an update, just in case anyone in future decides to do the same.

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cpu only works with ram. ssd has no moving parts so will load prog into ram quicker than hdd
the real problem comes when ram is full. cpu moves data back to hdd/ssd to make room in ram for the next data it needs. . its called disk swapping. more ram= less disk swopping so bettter performance.
nvme drive faster than ssd and ssd faster than hdd.