Doesn't matter the GIF embedded from another website or use WordPress's static thumbnail.
It generates the image from the first frame of the animation and save it to the directory with -gap jpg suffix..
Posts show the small size jpeg file first, your visitors don't need to wait for download the animation.
Activate the plugin through 'Plugins WordPress.
Preview images generated on the fly, first view of the posts might be slow..
Does it delete the generated preview image after delete the original post or original image..
Yes, you need to add gapStart to the area on admin...
It creates the image with the icon but does not lazyload the gif.
Prime the gif so that you don't have to wait for the entire gif to load before playback begins..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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