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Presumably because uBlock's baseline overhead is approximately 1 second. Therefore on other sites there is enough overhead from ads or tracking that it is still worth it to use uBlock.

Here's evidence[1] that uBlock adds less than 100ms to "an atypically large page from a nice site" (i.e. one that doesn't have any ads). Some other effect is at work here, it's probably just random network latency differences.

[1] https://github.com/gorhill/uBlock/wiki/Doesn't-uBlock-Origin...

So it has 1 second of startup cost? I have a hard time believing uBlock would add that much time to every request. Ideally this would make a more realistic measurement that doesn't include startup cost.

Or maybe it's just random variation.

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