Yes slower! Name one arm cpu that can perform faster than an intel cpu.
I9 cpus are doing 60k multi scores on geek bench and not even overclocked.
That is 6x faster than the fastest arm cpu today
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That's a $1700 chip. Spend $1700 on an ARM chip, and you can get a 32 core implementation.
ARM chips are all different, but here's a comparison between a 46 core Falkor and a 12 core Skylake chip. It's... competitive.