When I select images to optimize ("Optimiser sélection", it works... but only for like 40 images and the other ones keep waiting indefinitely. So on website where I have hundreds of images to optimize, it is a bit cumbersome
I'm having similar issue with either the Optimize All or if I try to optimize a bulk of 10 images or so. When doing bulk Optimize I can see some of the ajax requests return an error 504 (Gateway timeout)
How can we get around this? I have over 4000 images to optimize and can't do them manually 10 by 10...
(if you need access to the website in order to check further, just let me know. But I think it is quite general as I have the same issue on other sites...)