Customize menu > Preferences > Preference Settings dialog > Rendering tab > bitmap pager
Bitmap Pager group
The Bitmap Pager can help with the rendering of scenes that have very large textures, a large number of textures, or when rendering a high-resolution image.
On—When turned on, the software creates a series of temporary “page” files on the drive where it is installed for use in rendering bitmaps.
Page Size (kB)—Sets the size of the bitmap page. If textures are smaller than the page size, the system allocates only the memory required.
Bitmap Size Threshold (kB)—Sets the minimum size (in kilobytes) that a bitmap must be in order to be paged.
Memory Pool (kB)—Controls the amount of memory used by the pager. All pages remain in memory until this limit is reached. When the limit is reached, the pager begins saving pages to disk. Pages that are not frequently used are paged out; more frequently used pages are kept in memory.