what is the maximum read/write speed of the sdxc slot
I want to find an official answer to this question. How fast can this slot read an sdxc card?
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It may depend on the exact model of your Mac. Here is an article regarding the 14" & 16" MacBook Pros where it reports Apple confirmed the speeds have a max of 250MB/s:
https://www.macrumors.com/2021/10/21/2021-macbook-pro-sd-card-reader-speed/