|Feature||Device with Retina display||Device without Retina display|
|Interactive Image widgets||Use images that are 4096 pixels wide||Use images that are no more than 2048 pixels wide|
|All other images||Use images that are 2048 pixels wide||Use images that are no more than 1024 pixels wide|
|Keynote Widget||Set slide size to 2048 by 1536 in your Keynote presentation||Use the default slide size of 1024 by 768 in your Keynote presentation|
|3D Models||Use up to 50,000 moderately textured polygons||Use up to 20,000 moderately textured polygons|
Learn how to optimize performance in your iBooks Author books for devices with all display types.