[Webkit-unassigned] [Bug 264235] REGRESSION (Safari 15)?: Appending img elements to the DOM is slow when 1Blocker is enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=264235

--- Comment #5 from ben at benhollis.net ---
Absolutely, I’ll do that soon. 

In the meantime, it seems likely that what’s happening is that the list of content blocking rules is being evaluated synchronously, on the main thread, when the element is inserted into the DOM, rather than checking during the download of the image which would presumably happen in a separate thread. 

An interesting side effect of this performance issue is that a page can pretty reliably detect when a user has content blockers enabled in Safari.

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