What you are saying is 1.25ms on your network (5000/4000). That's twice as fast but still significant.
Found this [1], which might be helpful. The linked python program shows really high numbers for me though. Hopefully it's incorrect or I just misunderstand what the numbers mean.
[1] https://communities.netapp.com/thread/13445
What you are saying is 1.25ms on your network (5000/4000). That's twice as fast but still significant.