Technology
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Yeah, my SSD can do somewhere around 7GB/s read/write, barely half that with the encryption enabled.
And I have an external USB carry with an NVMe drive which should be perfectly capable of doing the maximum (1GB/s on a USB3.1 port) , but with encryption enabled, it's struggling to do over 350MB/s
That seems odd. You'd expect that if the cpu is doing the encryption and can do 3GB/s for the internal disk then it can do the same for the external one and be limited by the USB or disk speed of 1 GB/s
If it’s a Mac then it’s not the CPU that’s doing the encryption for the internal drive. Macs have separate hardware for that, the CPU can’t even get the key.
What machine are you benchmarking on?