NV+ Slow Read in 4.1.7, 4.1.8 & 4.1.9-T6

One thing you can try, when you are getting low read speeds, is to stop it, and actually try writing a very small file to the NAS first. Then retry your read operation. Many times I have witnessed my read speeds increase by as much as 20-30% by doing this.

I can reliably re-produce this on firmware 4.1.7. I believe there is a fundamental flaw on initial session initiation for MTU negotiation during what I call "cold read operations." Meaning that your PC has no current TCP/IP sessions with the NAS device.

I've noticed however that actually writing a small file first (size is completely irrelevant). Then performing read operations greatly boosts the read speeds. My guess is that the write operation somehow correctly negotiates the MTU, thus making the performance better for reads.

One thing to note on this is that I use Jumbo frames with my device. So this scenario applies there. I cannot speak for the same situation on a normal MTU of 1500. I haven't tested it on normal MTU settings simply due to lack of time and resources.

I've been able to reproduce this phenomenon for a while now, but have not had the time to persue the actual cause at a packet level to provide proof that the problem actually exists. . . such is the life of physics majors lol. . .