I had an original PNG image size of 799x999 at about 68KB. After running this plugin, it generated a "large" thumbnail of 479x600 coming in at a whopping 302KB!
In order to verify that this wasn't just an anomaly, I did approximately 70 more PNGs and every one of them was anywhere from 3x to 4x larger for the "smaller" resized image.
Seems kind of pointless to create thumbnails that are dimensionally smaller, but exponentially larger in size.
Actually works against download speeds.
The plugin does roughly what it advertises, which is why I am giving it two stars instead of one, but it completely fails to pick up the sizes defined with add_image_size().
Basically the plugin does what it's supposed to do, so that okay.
you end up with tons of thumbnail your WordPress installation will never need and never call upon = one way to fill up your storage...
I guess the problems with this is the WordPress code and/or how WP storage is sorted. Basically with any theme update you will only need resized thumbnails of all your featured images, as they are the ones being displayed on your front page and in widgets. But the plugin creates a number of thumbnails of every image it finds! So it includes logos, header images (both you'll never need a cropped thumbnail of!), it wants to make a thumbnail of your favicon (but thankfully fails), and so on...
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