Jetpack gallery shortcode with slideshow

Some solution for it given by a3 plugin

JETPACK SITE ACCELERATOR (PHOTON)
This is an option that you turn on as the Jetpack Accelerator (Photon CDN images) has its own lazy load feature that needs to be OFF first to be able use a3 Lazy Load as your lazy Load engine. Some users prefer to use a3 Lazy Load as it applies Lazy Load to videos and iframes as well as images.

https://wordpress.org/plugins/a3-lazy-load/

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