https://arstechnica.com/gadgets/2023/01/entry-level-m2-pro-macbook-pros-have-slower-ssd-performance-than-m1-versions/

In our review of Apple's new M2 MacBook Pros, our testing showed that the laptops' internal storage speeds were higher than those in the M1 MacBook Pros they replaced. But that won't be true for all models—9to5Mac has discovered that for the entry-level models with 512GB of storage, the M2 MacBook Pro's storage is slower than that in the M1 version.