Benchmarking different speeds when I actually run it.

[Rampage45]

I benchmark sha1 100. for 23,000 mh/s. But when I actually run it the speed is only 4000 mh/s
I'm using 4090 from vast.ai.

I got this message from hashcat.

ATTENTION! Pure (unoptimized) backend kernels selected.
Pure kernels can crack longer passwords, but drastically reduce performance.
If you want to switch to optimized kernels, append -O to your commandline.
See the above message to find out about the exact limits.

[Rampage45]

Update. I solve the issue I put -O in the commandline.