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sakurapremier said:
A bug(?) while handling blacklisted images.
I browsed comments just now, and saw an extreme_content image loading, and not hidden until fully loaded. So on a slow network one has a chance to "partially" see blacklisted images.
Delay in running Javascript by the browser.
Not nearly as bad as the one where the blacklist cookie isn't read initially so they remain visible until refresh or page change. (index usually)

Dynamic content is deferred by the browser until the page is fully loaded. If it should start to render the page before it has it all it can potentially defer JS enough for an image to not get changed.