The test results of the drive’s performance were published online shortly after its announcement (2023). The device had nothing extraordinary to boast about, and its test results were even more disappointing than the M1 chip model.
The MacBook Pro base configuration, with the M2 CPU, has a storage space of only 256GB. However, all the data is “packed” in one NAND chip which may have resulted in a decrease in speed performance. Modification received a 512GB SSD to address the same problem. Accordingly, the “firmware”, of the previous generation, was 3950 MB/s for writing, and 4900 MB/s for reading. The new version had similar characteristics and decreased to approximately 3150 MB/s and 2970 MB/s, respectively.
MacBook Pro M1 512 ГБ 
MacBook Pro M2 512 GB
9to5Mac journalists found that Apple laptops with M1 CPUs perform better because of the use of two NAND module instead of one. It was also mentioned that SSD write and read speeds are not affected by everyday tasks as well as the benchmark.
A source: