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I prefer fresco because actual jquery support. But I need functions like start/stop slideshow or smooth image change. What should I do??
Both are based on jquery.
Fresco moves almost instantly between images because I feel that the transitions as seen in Lightview create too much of a gap where you're just looking at an animation instead of an image. The slideshow was removed because it wasn't used much in practice.
So all these changes are intentional. If you prefer longer animations or a slideshow, Lightview would be the better choice.