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Checkmate said:
Should be fixed, let me know if it's acting up.
Fixed for me. Thanks!

But to answer to flandere: it occured the most when I was reloading a page after having updated the tag list for it.
– From the index page (no slow loading for the thumbs), middle click on several thumbs to open their pages in background tabs. Pages were loading normally.
– Edit tags for a post, save changes. This time, reloading was really slow with the sample picture partially showing, then completely but staying blurry for 10 or 20 seconds.

SauceNAO search was really slow as well.