Unfortunately I don't have a before result, but for what it's worth I haven't noticed a performance hit. My iPhone 6 also gets a single core score close to his multi core score on his iPhone 6, so he might need a new battery. https://browser.geekbench.com/v4/cpu/6326517
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Entirely possibly I haven't noticed a performance discrepancy, just thought the raw score difference on the same hardware and software was interesting.
End of conversation
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That's 11.1.2 vs 11.2.2, instead of 11.2.1 vs 11.2.2. The battery discharge rate is lowered and CPU throttled down consequently.
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