256GB Mac mini' with M2 chip has fewer chips than the previous generation, so it turns out that SSD speed is slow, 512GB MacBook Pro with M2 Pro also slows down -
MacBook Pro 2018 Lineup Have the Fastest SSDs ever - Results Pointed Out in Latest Benchmark
Benchmark SSD & Hard Drive Performance with Disk Speed Test for Mac OS X | OSXDaily
Daily Mac App: Disk Speed Test | Engadget
Tech ARP - How Fast Is The 512 GB PCIe X4 SSD In The 2015 MacBook Pro?
MacBook Pro 14 512 GB with M2 Pro apparently has a 40% slower SSD than its M1 Pro predecessor - NotebookCheck.net News