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How can I figure out if a Safari extension is using unreasonable memory/cpu? I'm not really experiencing any unreasonable sluggishness, but I am starting to pile up on the extensions and was considering pruning the most performance draining ones just for good measure.

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Disable the extension. Run Safari for an hour (normal use) and note the kind of cpu/memory usages you get from it (using activity monitor or top).

Enable the extension. Repeat.

1

You can also use Instruments and attach it to your safari instance and start from there.

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