Terrible upload speeds

In addition, when I check the traffic manager in my router, when uploading to youtube it shows my speed as around 580KB/s which matches up with the speeds im seeing, and with the twitch test. If I run the official cox speed test, it shows 4000KB/s which matched up with what the speed test says, if I run a speed test through testmy.net it also matched between the routers traffic manager and what it says in the test results. Why does the speed take such a hit on EVERYTHING except the official cox speed test? Is it designed to make the average stupid consumer feel like they are getting all this amazing bandwidth? whats going on here?

I've been having problems with my upload speed since April.  I have a new router and modem and the service line and all cabling have been replaced.  I give Cox an "A" for the effort  they have put in to try and fix the issue but the problem still isn't resolved.  Like you say, download is great.  Only problems with upload.

I want an explanation from Cox as to why their Cox branded tools show such amazing speeds, yet real life tests show awful speeds. Smells like fraud to me. Seems like their tests are rigged to show us what we want to see. Its like VW scamming people with their false emissions testing, I smell a class action lawsuit

Also, in my twitch tool, it shows the quality as 0 even though the speed may be 3000kbps, that means i must be getting TONS of dropped packets somewhere. Based on my research that what it means, and that matches up with my twich streaming attempts. Does anyone know any other tools to see if im getting dropped packets?

According to my Modem,

Upstream Bonded channels

Channel 1 41.7dBmV

Channel 2 41.7

Channel 3 42.3

Channel 4 43.8

according to http://forums.cox.com/forum_home/internet_forum/f/5/t/13163.aspx

I need to have a tech come out and install an attenuator to my line as the power levels are below the 45 threshold, they should be between 45 and 51

So just run a bunch of traceroutes to like youtube.com and twitch.com? Ill try that and post the results. I feel like this is something that COX network engineers should be doing. Why am I tuning their network for them? Im paying $100 a month so that I can be a network admin , hooray. 

Your upstream power levels are fine. An attenuator literally won't do anything to your connection except add one more source of impedance mismatch, thus having your modem distort its upstream carrier waveforms even more to overcome the new impedance. You can have them at 30 dbmv and it won't effect packetloss (as long as there is no noise on your drop or house wiring). As long as your modem is transmitting enough power to reach the CMTS around 0, its fine (you dont want it above 49 though or below 28 but that is a technical write up for another day which gets into group delay issues).

As to your upload issue, cox can only guarantee your speeds within its network. Remember, you are only testing using a single source. You are given 30 up on your plan which included multiple sources. Number of hops and distance you're testing to or uploading to effects the speed your can transfer at. You also have to remember the upstream is a small slice of bandwidth in a node (120 mbps max throughput with 4 upstream carriers at 64 QAM, but really 100 mbps when you take in overheard and how the upstream uses A-TDMA) and packets are prioritized with tags. VOIP on MTAs get the top priority, then other real time streaming such as videoconferencing and so on and so forth with ICMP (ping tests) having the lowest. 

The only things really that can effect your upstream speeds within cox's immediate network is noise or congestion. If you are getting your full upload speeds when testing to a local server either in Cox's network or in the local vicinity, then likely there is nothing crazy going on in the network. If you still feel like you're getting juked out of your speeds to an outside source, you can try to get an engineer to ensure the backend and backhaul routers are in good health (and 99.999% of the time they are). 

Just my 2 cents. If anyone would like to point out an error on my part, please feel free. 

So, two days ago, using my twitch tool, it was showing "Over 10000kbps" with a quality score of 95. It stayed that way for all of one day. Now its back to the same BS below 4000kbps with a 0 quality rating. So the network is clearly capable of supporting these speeds, I think there is just an issue somewhere. I wish a Cox support tech would respond to this thread. Its back to garbage after being good for all of 24 hours. I have not changed anything and im pretty sure that twitch, google, and dropbox didnt magically change something for those 24 hours then change it back to being crappy.