Which image viewer is faster?

Question

Search Engine Optimization

Which image viewer to put on the site? Site on WordPress. Site speed priority. A caching plugin is used.

Answer 1

I did a little work, I will share the results.
Perhaps the viewer that will have the least impact on speed is fancybox 1.3.4, but I had conflicts with it when connecting a more recent jQuery library. But I observe such a viewer on a site that has everything buzzing with the download speed.
From the work done, I singled out 3 viewers: WP Lightbox 2, WP Featherlight, Lightbox with PhotoSwipe.
I put the last one as the leader: Lightbox with PhotoSwipe.
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Here are the Lighthouse results before connecting the viewer:

All measurements were taken with the caching plugin enabled.
The results for WP Lightbox 2 and WP Featherlight are the same:

You can see that the first render time has increased by 0.5s, "Largest Contentful Paint" by 0.4s and "Time to Interactive" by 0.4s.
"Largest Contentful Paint" got bigger, I think, because the page got bigger for the size of the plugin.
This parameter for 3 viewers will be the same in 3.5 s.
At the same time, I did several checks for speed and stability, but these numbers appeared more often than usual. If the overall figure, then the score ranged from 89 to 94.
However, in terms of design, WP Lightbox 2 will be cooler and it has a little opportunity to customize something.
After activating WP Featherlight, I didn’t find any settings available through the admin panel, maybe there is some kind of config file in the root of the plugin, but I didn’t check it.

Only the "Largest Contentful Paint" parameter has increased significantly.
At the same time, the design is for an amateur, there is no transparent background, but there is a zoom tool. loads the image immediately.

I will choose it.
Maybe someone will be interested.
Do not judge for speed figures, the main thing is that these figures can be compared)

Answer 2

Better give pictures without direct links