benchmark metrics for measuring scrubbing performance.

Hello. I have a system that behaves great when scrubbing media on internal and external drives, but poorly when the same file is on a network drive. This network drive is a Quantum Stornext that i access through fiber optic and on all benchmarks tests that i have done performs way better than any other drive. However, imported media from this drive lag, stutter, show only a few images when dragging the playhead on the viewer. Even my slowest internal drive outperforms it on this matter. I guess there´s a problem with the Stornext file system, but i´m having trouble communicating it to the support team.

Is there a test that i could do outside premiere that would show me this difference in performance? Sequential reads, random reads, iops, nothing show me a disavantage on this system. Or perhaps should i look to the network side of things?

Also, i would like to add that i reproduced the same problem in davinci resolve and on other machine. 

Thank you.

for the images, P: is the Stornext, G: is a internal sata, H: ia a external Lacie Raid.