Slow single-threaded upload speeds
I recently started noticing that file transfers from my Linux server over my Cox Ultimate connection seem to top out at around 5 Mbps (600 kB/s). Previous speed tests (including the one on the Cox support page) showed that I was getting close to the 300/30 that is advertised, so I didn't think much of it. However, after reading this thread
I'm thinking that I should expect to get much higher throughput on single-threaded upstream connections. Today I ran a bunch of tests from testmy.net and am getting uploads between 3-5 Mbps, which is consistent with the file transfers that I do regularly. I've been on Ultimate since Jun 2016 using an SB6183 and I believe my signal stats are within normal limits (see attached screenshot). I've done some tests from my sister's house just a couple of miles away, and even though she's only on Preferred, testmy.net upload tests show over 7 Mbps from her network (which is even higher than the advertised 5 Mbps for that tier).
On the surface, my situation seems similar to the individual who started the thread above, and if my problem is due to equipment on my street, then I'd certainly like to have Cox address it. However, I'm not thrilled about having to jump through a ton of hoops with Level 1 support to prove that it's not something with my equipment. Please advise--thanks!