Managing performance with thumbnailsTo speed up the rendering of images in container fields, FileMaker Pro by default generates image thumbnails and caches them in memory.The container data can be embedded in the field or stored externally. FileMaker Pro encrypts thumbnails that are in secure storage and that are embedded.
1.
2. Click the Thumbnails tab.
3. Select or deselect Generate and store thumbnails for images.
Select Temporary storage (the default). Select Permanent storage.
5. Click OK.