This message is caused by having 3ds Max bitmap paging feature enabled. Bitmap paging often drastically reduces rendering performance. It is always strongly suggested to disable it.
Scene file has 3ds Max bitmap paging enabled.
Open 3ds Max Asset Tracker (Shift+T)
In the top menu, under Bitmap Performance and Memory, uncheck “Enable Bitmap Paging”
Save your 3ds Max scene
Close 3ds Max
Start 3ds Max again
Open your scene
Open 3ds Max Asset Tracker and make sure “Enable Bitmap Paging” menu entry is still disabled
Note: Disabling 3ds Max Bitmap Paging requires complete 3ds Max restart to take effect!
See: Bitmap Paging forum thread