The Prizm Image plugin lets you reduce the file size of your images by up to 70% while maintaining resolution and visual quality.
The only issue i've seen is that it took a fair amount of time to do 25 images and didnt seem to finish, may be i should have waited longer though
I think it's a great alternative to other plugins that optimize your images. It could use some more settings and when you run the bulk opmization it's very slow and it takes forever.
That said the results are very good. I went from a Google Page speed of around 50 to aroung 90 just optmizing my images.
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