How Fix Slow Speed - Wifi Cable Modem Router C6300

Question

Hi, I'm using a WiFi Cable Modem Router, model c6300. I have had the modem for about two years now. I didn't use it for a while. I started using it again about 8 months ago. My internet speed is so slow, I thought because of internet service provider plan. I contacted my service provider, they troubleshot, even upgraded my service to 150 Mbps. But I'm getting less than 90 Mbps through ethernet and 30 Mbps through wifi when I run a speed test. I tested wifi with multiple devices like phones, computers, tv, etc. I called support for help they said my warranty is expired, I have to purchase service in order to troubleshoot and fix the issue. Right now I can't afford to purchase a new router or purchase support.

I did a reset, but it didn't improve the speed. Is there a way to improve the internet speed?

I appreciate your help.

libra22 · Answer

Thank you for your response.1. I tested with both 2.4 and 5ghz, as well as I tested with the ethernet cable. With 2.4 ghz I was getting less than 30 mbps, with 5ghz I’m getting less than 40 Mbps and with Ethernet cable, I’m getting 85 to 90 Mbps.2. I tested from my laptop, using wifi and Ethernet cable both, I mean tested with wifi, then with cable. I also tested from tv where I installed a speed testing app, though I connected the tv with an Ethernet cable. I also tested from iPhone.3. I connected with wire and took this screenshot.Appreciate your help.&nbsp;

libra22 · Answer

I think I figured out the issue. I think my tv was causing internet slowness. I don't know how or even that's possible, but today I moved my modem/router from the living room to another room where I work. I thought cable is faster than wifi so I'll use a cable with this router till I'll able to fix this one or buy a new one. So I tested internet speed it was close to 300 Mbps with the ethernet cable. I tested 5 g from my phone it was close to 150 Mbps. I tested the tv, its speed was 143 Mbps. The modem is about 30 to 40 feet away from the living room. the living coaxial cable was fine, these cables were installed recently.&nbsp;Thank you for helping me to figure this out.&nbsp;&nbsp;

plemans · Answer

1. are you testing wifi over 2.4ghz or 5ghz? 2.4ghz is a much slower speed and that wifi speed is about what you expect over 2.4ghz. 5ghz is faster and should hit faster speeds.&nbsp;
2. what device are you testing wifi speeds on and what are you testing wired on?&nbsp;
3. have you checked your wired speeds to see if you're connecting at gigabit speeds or fast ethernet (10/100mbps)
https://kb.netgear.com/24222/How-do-I-display-Internet-port-statistics-on-my-Nighthawk-router
&nbsp;

plemans · Answer

A couple things.&nbsp;
1. your ethernet connection is only showing 10/100mbps. Not gigabit. So not sure if your device doesn't support gigabit or if you have a sketchy ethernet cable (poor quality cables can cause it to drop from gigabit to 10/100mbps). so try a different cable or a device that supports gigabit
2. most tv's aren't gigabit because they don't need it. 4k streaming only takes 25-40mbps so most manufacturers don't include gigabit and just 10/100mbps because they don't need them. so your tv isn't trusted
3. your 2.4ghz seems about right for that device. 2.4ghz is a slow network and sensitive to interference.
4. your 5ghz seems a little slow. What device are you testing 5ghz on? have you tried changing what 5ghz channel you're broadcasting on?&nbsp;

libra22 · Answer

I'll buy a new ethernet cable and test it again. Why 5g is slow? I tested from two computers, and iphone.&nbsp;&nbsp;Thanks

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How Fix Slow Speed - Wifi Cable Modem Router C6300

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