Paying for 2 gig and getting 136mb-158mb download speeds

A 2.5 or 10 Gbps NIC is needed for more than 1 Gbps speed.  If OP is paying for a 2 Gbps plan and has a 1 Gbps NIC, he's paying extra for speeds that can't possibly be obtained.  But, with 158 Mbps current download, it's unlikely a faster NIC could get anywhere near 2 Gbps anyway.

We don't know what he's getting the speed on, or how it's configured. If he's on a WiFi using 2.4ghz, at 40 feet plus away, that speed is exceptional. 

Thanks for responding. This is the kind of help I'm looking for. If I can upgrade my hardware I will, if not I'll downgrade my COX plan to 1gig.

Here is what I have (PC): 
NIC = Intel Wi-Fi 6 AX201 160MHz

Current Connection:
Protocol: Wi-Fi 6 (802.11ax)
Network Band = 5GHz
Link Speed currently (544/245) (Already better that when I posted. Not sure why the jump.)

My Phone:
Galaxy s20+ (Based on the input above these are good speeds for the phone. Thanks)

I will be testing the connection via CAT6 and will post Wired speeds when I get a chance to do that as well.

Thanks again 👍

What modem/router are you using? I am currently running a Netgear CM2000 and for the router, a Netgear RAXE 300. I can tell you they smoke! My computer has a Killer E3 100g 2.5 gbps ethernet adapter, and I can tell you, if you can run ethernet it's the way to go. WiFi can be affected by too many things.

Funny story, When I was working Tier 2, I had a customer call in, that every day at 1 pm, her wifi dropped. Ethernet was good, wifi went to 0 connectivity. Turned out her next door neighbor had a baby monitor, and when she put little junior down for a 1 pm nap, and turned on the baby monitor, it was strong enough to take out hers, and both of her neighbors WiFi. 

Also remember, 5 ghz, radio wave travels over 2x the distance in the same 40 ft, then 2.4 travels, because it goes up and down 5 vs 2.4. What that means is, it loses it's speed twice as fast as 2.4 does. ^ Ghz, (WiFi 6) even more so. ALSO, to run WiFi 6 properly, you have to name all 3 frequencies with the same SSID and wpa key. 

Made a cat6 cable and tested the connection Wired. Getting 900.39/947.77 so wired is definitely the way I'm going to set this up. Just a lot more work and some attic time😓

If you've never obtained more than 100 Mbps download, you may have a 100 Mbps NIC.  If you do (conditional), you can't possibly get more than around 96 Mbps download.  You need a 1 Gbps NIC for download speeds greater than 100 Mbps.

I have an intel 1211 gigabit nic, and I’ve gotten up to 750 with other providers. It’s only with cox that i have problems. 

I didn't really expect that to be your issue.  It's probably been a while since PCs had a 100 Mbps NIC, but you never know.  Try contacting cox.help@cox.com   and provide your full name, service address and a link to this discussion.

Hi danafletcher,

Hi there, we surely want you to get the speeds you pay for.  As CurtB mentioned, please reach out to us via email at cox.help@cox.com so we can investigate.  

We look forward to working with you.

Cox Support Forums Moderator

It can happen, but - - - swap out your ethernet cord. Sometimes if there is internal interference or crosstalk, it will drop the speed down to 100 mbps. Try a CAT 5E, instead of CAT 6. For some reason they tend to have less crosstalk. 

Also, open up your ethernet settings, and see what speed it says it's communicating.