A quick test.
Copy and move 100GB of data from an external SSD.
The 256GB version took 3 minutes and 40 seconds to copy 100GB and 3 minutes and 45 seconds to move the 100GB to the external SSD.
The 512GB version took 1 minute and 40 seconds to copy and 1 minute and 42 seconds to move.
The iPad Pro M5 took 38 seconds.
Copy and move 100GB of data from an external SSD.
The 256GB version took 3 minutes and 40 seconds to copy 100GB and 3 minutes and 45 seconds to move the 100GB to the external SSD.
The 512GB version took 1 minute and 40 seconds to copy and 1 minute and 42 seconds to move.
The iPad Pro M5 took 38 seconds.