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image won't load up any when switch off "fetch full image"

and the reason I want to turn it off is because:

when "fetch full image" is on, the loading can be slow that you cannot take a quick view of the album like it in the original page layout;

and since there's not a option to turn off the "infinite scroll" of the page, the loading could take longer for reference to the original ehentai page layout.

I can't reproduce the issue. Please check if you have any other userscripts interfering with YAEV.
If not, please tell me the browser you're using (and the version).

The embedded gallery view only fetches images for what is on screen in your viewport. It also fetches thumbs first, so there should not be any difference in loading speed compared to ehentai's normal gallery.

Also send me the logs from the console (F12, console tab).

This is fixed in the latest version. You do not have to disable full image fetching (it will be fast even with that option enabled).