These gains are probably moot though if you use a Gecko based browser that can support adblocking on a much deeper level than Manifest V3 limits you to. The speed benefits from excellent blocking of careless ad networks are just ridiculous and instantly felt.
While these updates may improve loading performance by a few percents after a lot of hard engineering work, blocking ads on a deep level ahead of even loading them can instead easily cut several megabytes in one go.
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