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Page A loads content for X seconds and Z seconds loads ads. uBlock overhead is Y second but saves Z seconds by blocking ads. Total time with uBlock is X+Y-Z. If page has zero ads the time will be X+Y-0 which is greater than X+0.

It's also probably entirely random fluctuations in this case. uBlock doesn't add anywhere near that much latency normally.

Just to clarify, this is desirable because "fewer/no ads" is preferred over "faster page load times"?

Yes. Pages with ads are unreadable. I'm horrified every time I see friends navigate with no adblockers. I always recommend one. I'm going to start recommending Firefox again, as I did at the times of IE6.

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