Unfortunately I don't know anything about the internals, even after some research. The results I listed above were in Chrome browser, so I reran the tests in Firefox and Safari and got wildly different results.
Firefox v78.0.2
For (100%)
Reduce (73%)
Set (65%)
Safari v13.1.2
For (100%)
Reduce (64%)
Set (18%)
Chrome 84.4.04
For (100%)
Set (78%)
Reduce (37%)
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Unfortunately I don't know anything about the internals, even after some research. The results I listed above were in Chrome browser, so I reran the tests in Firefox and Safari and got wildly different results.
Firefox v78.0.2
Safari v13.1.2
Chrome 84.4.04