How to improve latency when using images high resolution

I use a lot of images high resolution in my iBook, which creates a lot of lag when using author ibooks.  I have an end of 2015 with skylake processor i7 iMac and a decent amount of video ram.  Is it possible to improve this gap without use the workarounds like spreading the images until the end?  This is a limitation of the application?  I am able to work with images in Lightroom quickly with little or no lag, why I have this experience with ibooks author?

It was common to use the placeholder images while editing, simply because of the question, you say.

Regarding the ram, better for computer max (video ram isn't the issue) in all cases, but with the new Macs after having soldered to the ram, which can be difficult to correct after the purchase.

Shame to see iBA still suffers this awkwardness, but oh well.

Tags: iBooks Author

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