When I first installed MSFS I had loads of room on a dedicated 1tb ssd, which is fast increasing. As I had loads of room I set the rolling cache to 100gb. I recently read a suggestion to set it at 2gb so tried to reduce from 100 to 2gb  but a pop up came up telling me I can increase but not reduce it. Any bright ideas?

16gb-32-64 or 0gb with no cache at all (disabled), try any of them. The problem is the game is a bit all over the place right now, could work for you or against you. It's totally your own decision. 

Delete it, then recreate at the new desired size.

Delete, recreate as odourboy said. I have it at 32gb

Edited August 3, 20214 yr by CarlosF

yo tengo 200GB.:)

 

When you fly around, the simulator fetches world data from the cloud (eg textures, photogrammetry, etc.). Rolling cache avoids repeating the same network requests by saving the responses to disk and reusing them. I think it's important to have at least a small cache to avoid wasting bandwidth (if I remember correctly, Seb recommended 8GB in one of the Dev Q&As). Note that sim upgrades can cause old cached data to become incompatible with the new version and may cause crashes, so you should always delete and recreate your cache with new versions.

If your bandwidth is not great or you have aggressive data caps, you can go big on the rolling cache and maybe get a dedicated drive. If you mostly stay within the same part of the world this should help quite a bit with performance and data usage. However, in most cases this is probably excessive.

Edit: A couple of other things. Even a good internet connection can experience random performance issues and rolling cache helps mitigate that. Also, keep in mind that the cloud hosts petabytes of world data and you won't realistically be able to cache a significant percentage of that so you get diminishing returns as you increase the cache. Overall consider how much disk space you're willing to give up to save bandwidth.

Edited August 3, 20214 yr by eltair