According to CrystalDiskMark 7 with exFAT around 62 MB/s for sequential write and 1.8 MB/s for random write. For reading, it is slightly more than twice as fast (150 MB/s sequential and 3.3 MB/s random).

I tested my SANDISK 128GB with the tool CristalDiskMark 7 and got the following values: Write sequential = 20.10 MB/s and Write random = 0.42 MB/s.