ADMIN NOTE:
SkyMaxx Pro v5.0.1 has been released and supersedes this post for the time being:
-------------------------------------------------------
We have received numerous reports of insanely high RAM usage up to the point X-Plane eventually crashes and/or FPS are simply unsustainable.
In every one of these instances, XPRealistic has been in use and the culprit of the issue.
Our best guess at the moment would be that they are somehow changing the format of the depth