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Using the geekbench Benchmark browser, comparing single core performance
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MacBook Pro (13-inch Retina Early 2015) – Intel Core i7-5557U @ 3.1 GHz (2 cores) – 979
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MacBook Air (Late 2020) – Apple M1 @ 3.2 GHz (8 CPU cores, 8 GPU cores) – 2327
———Might not be 100% relevant to your use case, but some small performance gains have occurred in the last 8 years.
Cheapest M1 MacBook Air on the refurb store right now is £850. If your 2015 is your main machine you will be astounded by the battery and performance differences that gets you.
@ectoplasmosis @grams interesting, ok. dunno if helpful but this is what i'm on currently, presumably same assessment?