Hi,
If the FROST object is hidden I would expect not to update the mesh, as all the update settings is telling not to, “frost changes” and “particle changes” OFF, but it still does and cost time.
On the other hand on MAX Autosave FROST is also updating meshes regardless if they hidden or not. same on load scene with hidden FROST objects.
thx
Bandu
I can confirm that Frost updates while hidden when using the Nitrous viewport in 3ds Max 2012. I will look into fixing this in a future release.
I did not observe Frost updating during autosave, so I will need some more help from you:
I see now we are using Frost 1.0.5.44127 
I will try to make the IT to update to the latest version and see how this works
will give you an update on this…
thanks,
Bandu
I can confirm it also happens with the latest ver of frost (1.1.2.44769) on max2012 64bit sp1 . Changed nitros to direct3D and it still happens.
I have reproduced this problem with the Nitrous viewport, but not with Direct3D.
Could please send me a scene that reproduces this problem when using Direct3D? You can submit scenes using our ticket system.
Thank you for sending us a sample scene. I have reproduced this problem in Nitrous and Direct 3D. We will look into fixing this in a future release.
No problem 
Please make sure you notice it also updates on scrubbing when both “when frost changes” and “when particles change” are checked off. Hidden or not.
Also, that’s more of a feature request then a bug , but I’d expect frost not to calculate on render when it’s visibility is 0 and when it’s not visible to the camera.
Thanks!
These checkboxes control whether to react to parameter block changes and to notifications from other objects. Neither controls time changes. We might want to have a third checkbox “when time changes” and when you uncheck all 3, it will go to “manual mode” where you must press the button to update.