Comcast Slow-Speed Internet

  • Problem
  • Updated 2 years ago
Over the past several months, my Comcast cable internet service has had periods of extremely slow internet connectivity. Pages timeout and speeds more comparable to dial-up. During the latest period, I went to speedtest.net and checked my speed.

0.44 Mb/s down, 0.28 Mb/s up, and 423 ms ping is terrible! It causes pages to timeout, drops me out of online games.

I have contacted Comcast phone support and received very little support. The Rep walked me through the usual script...reset cable modem, reset router, reboot PC, etc...I played along, complying with the representative's steps until I eventually gave in and ended the call. I need a Network Engineer to do some network traffic analysis, not a level 1 CSR reading from a script.

Reaching out here because I don't know what else to do...
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Danny Sullivan

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  • frustrated

Posted 6 years ago

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k

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Having the same issues. Hotmail will not load but only when using comcast, been like this for a week. Getting multiple timeouts and tech support is terrible. Spent an hour with them telling me to delete my cookies and to reset my modem. There is a problem on their end. Comcast is the absolute worst, this is what you get with a granted monopoly.
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Gilles Lamant

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Same problem here... (I just posted a question on the forum a bit earlier), and little hope of real anything happening.
A few years ago, I actually did a full log (running network analysis every 30 minutes) and sent that to them... At that time, it felt like... something became better... but now... in the past few months, it seems it is broken again...
I am in 94086 area (CA).
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jwrigh26

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Same problem. Comcast sucks! If there was another company in my area I would so change service
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None

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http://www.speedtest.net/result/65668...
I got this, it was because I completely reset the router and modem, you have to take the battery out for results.
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Myron Larson

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I am now having the same issues. Just started two days ago.
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doriewinquist@comcast.net

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have been helped very little only lasts few days...bill goes up service so poor
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Gabriel Jovellar

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Right now my comcast connection is .11Down and .10Up It's so slow! But I do also have two comcast internet connections in my house and they are both doing it, I have 3 Computers 2 PS3 they all are experinceing this slowness. I have about 8 MPS and i tryed turning everything on and checking each computer and they all have the same problem! Slow internet, so I checked my other internet connection (*Yes I have TWO internet connections in my house *Yes they are both comcast!) in another room where it is only connection to ONE Pc and that was is also creeping like a snail... I have no idea wth is wrong with this crap and this slow random stages are driving me nuts!!!!!!!!
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gajahduduk

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me too, it's driving me absolutely nuts. talking to comcast doesn't help. they even sent out a guy to replace a "water damaged" line a few months ago but it continues.
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barbr7

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I am having the same difficulty for at least the last week. Feels as slow as dial-up. Checking my email on their SmartZone is an ordeal. Keep getting the message that the server appears to be slow. The odd thing, and this makes me believe it is Comcast, is that sometimes during the evening hours, the connection speed appears to be normal. During the morning and afternoon it is horrible.
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RobBarry

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Same issue. Horrendously slow speeds for hours on end.
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swiforum

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I was having same problem for two days - very annoying and frustrating browser timeouts. Now I have reset (power cycled) the modem and router. That seems to have fixed it for me.
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Samuel Travis

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My iPhone is faster than comcast "High speed internet".
This blows.
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Christopher Guzik

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I've comcast cable internet service and up until a week ago it was awesome, superfast, no problems. Strangely, comcast called offering to upgrade my service to xfinity for another $40 per month and the next day after declining the service went straight to hell. Getting .5dl and 1.3ul.
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Strom

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I can't believe I am paying monthly for this. I could watch mold grow and it would probably beat my dl speed.

Was fine until about 1 month ago (with a similar episode 5-6 months prior). Resetting router does not help. I've tried having comcast reset, resetting myself, flushing my computer's dns tables. Comcast, have you no pride in your service? Try listening to your customers for once.
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PAZ002

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Can always use this test to see if Comcast is throttling the internet (which they are actually) throttle test

More likely they are going to stick behind the "best effort" jargon, as long as you are getting internet service they don't really care what your speeds are.
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colymoore

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We had terrible problem, totally cured by replacing router.
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tuca.christian

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we are having the same problem, but what i am thinking is that the router might be the problem, so i will get a new wireless router to see if that solves the problem, i have had my router for about 5 years now. if that does not resolves it, i am done :(
AT&T (DSL) was faster than Comcast (cable)
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David Eubanks

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I constantly have to reset my modem while unplugging my linksys wireless router to restore my speed. The speed degrades with usage, just a hour of activity will bog things up. I am constantly getting timeouts. Called Comcast - they put you through the modem reset routine. Nothing gets better.
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nathan.t.holder

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I have started taking screen shots of the results of my speed tests at 7am and 7pm each day.

I plan on sending the results to comcast, the bbb of knoxville/johnson city, and the chamber of commerce of johnson city.

I also contact Comcast once a day now and ask to have the network re-evaluated. They always respond with a no and give some BS about how they are monitoring traffic and there is no traffic at the moment. (Yet their own speed test shows 1.3 Mbps well below the 6 Mbps I pay for)

I doubt any of it will do any good but hopefully Comcast will waste some of its time and money. (The only real thing we can do against douche bags who abuse their monopoly)
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Myron Larson

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I think it may be possible that your primary problem is the fact that Comcast is unwilling to send a service person out.
I finally called someone and they came out and fixed the problem. The problem was that they initially installed an out date modem and once that was replaced as well as replacing my router I went from NS! 1.5meg download speeds to 20meg.
I may be suggesting something you have already tried but if not then hopefully it will work.
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John Dye

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I guess I will join the club too. I’ve been on Comcast now for the past 8 years for the most part the service has been great but in the past 2 weeks the service has gotten pathetic. I had a problem 2 weeks ago the tech came out and replace the feed cable from the road to my home and just this Thursday a crew came out to bury the cable. Problem cropped up again slow downloads and dropped packets. Tech just came out today states the cable must have been damaged during the process of burying and he replaced with a new run. The tech came into my home and said the signal levels were ok, tested with speedtest.comcast.net and got the following times 3.78 down and 4.2 up 24ms ping times I was getting the same results prior to the tech replacing the feed cable. The tech stated it was probably a problem with the cable modem and I went out purchased new Motorola SB5101NUto replace the existing Motorola SB5120; after replacing there was still no difference in times. Prior to 2-8 I was easily getting 20m downloads. I honestly wish that I had another option for an ISP other than Comcast because after all these headaches I would have already terminated their service......

Just an update the admin here on the board contacted me and I emailed him a response to his question, so I'm awaiting a respnse back. Also found another website http://measurementlab.net/measurement... with some good testing tools. I got the follwing response back from their test

WEB100 Enabled Statistics:
Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done.
Checking for firewalls . . . . . . . . . . . . . . . . . . . Done.
running 10s outbound test (client-to-server [C2S]) . . . . . 4.05Mb/s
running 10s inbound test (server-to-client [S2C]) . . . . . . 3.57Mb/s

------ Client System Details------
OS data: Name = Windows 7, Architecture = x86, Version = 6.1
Java data: Vendor = Sun Microsystems Inc., Version = 1.6.0_23

------ Web100 Detailed Analysis ------
45 Mbps T3/DS3 link found.
Link set to Full Duplex mode
No network congestion discovered.
Good network cable(s) found
Normal duplex operation found.

Web100 reports the Round trip time = 201.18 ms; the Packet size = 1460 Bytes; and
121 packets retransmitted, 518 duplicate acks received, and 535 SACK blocks received
The connection was idle 0 seconds (0% of the time)
S2C throughput test: Packet queuing detected: 5.60%
This connection is receiver limited 7.6% of the time.
Increasing the the client's receive buffer (279.0 KB) will improve performance
This connection is network limited 91.58% of the time.

Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: OFF
RFC 1323 Window Scaling: ON; Scaling Factors - Server=8, Client=7

Server 'ndt.iupui.donar.measurement-lab.org' is not behind a firewall. [Connection to the ephemeral port was successful]
Client is probably behind a firewall. [Connection to the ephemeral port failed]
Packet size is preserved End-to-End
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address
Server says [xxx.xxx.xxx.xxx], but Client says [xxx.xxx.xxx.xxx]

I also spoke to my neighbor across the street and they are also having many of tmodem and he same problems. Finding it difficult to swallow modem and house wiring problems
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John Dye

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Just another update called Comcast again this morning and was promised a tech will be dispatched again for tomorrow afternoon...This time customer service was trying to point to my Vonage SIP adapter. As I was speaking to customer service via my blackberry I'm watching foxnews the signal is pixelating, garbling and dropping audio. No analog TV here just digital so its obvious I'm getting packet loss. Will post after they are through tomorrow
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John Dye

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Well the Comcast tech was out today and no it was not my wiring or my modem and it turns out that there has been a Comcast tech in my neighborhood for the past 2 weeks working on the plant. Apparently the helpdesk has been clueless as to what has been going on. I was told they would be working the remainder of the week on the wiring and amps and also told that they would be replacing node over the weekend due to the impact on local businesses. I seem to be making process, but we will see.
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barbr7

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@ John Dye - one of my major and frequently reiterated complaints to tech support desk is that they are not in the information loop. I keep telling Comcast supervisors that customers are much happier with information. Besides, I really resent having to go through the same routine with every rep. I also insist that they update the record while I am on the line as I have discovered many do not write down your call and any troubleshooting that was done. I get the name of the rep at the beginning of the call. Good luck with the node replacement. That should do the trick for you. Of course, be sure to get refunds for the dates of service.
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Helmut Schillinger

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Same problem here. California, Pollock Pines. Download speeds of 18 kb/sec and less. Comcast is making lazy excuses. I am not interested to be as usually talked down too by a techie (restart you modem blah blah). Its about time Comcast realizes that people are not as uneducated in simple technical matters anymore. Obviously they are capping against the law.
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Andrea Marquez

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We are having the same problem... I am tethering from my Nexus one wireless and the whole family 4 people are working off it and it is faster than com cast...our net flicks wont even load on the TV.. it really sucks... Oh yeah and yesterday Com cast called and asked did I want to add an extra charge of 10.0 per month to speed up our internet.... so they slow us down so they can charge us more to put us back to where we were before the upgrade.. its extortion
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Blaise Pascal

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We have been struggling with this same problem for over a year now. Just got a new router. Initial speed was like 20/5 Mbps (down/up) then it degrades over a few hours to 5/1 Mbps (down/up). Horrible! We reboot our modem and router several times daily to "survive."
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kindness.killeth

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Out of nowhere, I was having excruciatingly slow internet speed on Comcast. The Comcast tech advised that my Motorola SB 4100 was at the "end of life" and that I should upgrade. Skeptical, I purchased this modem which is a DOCSIS 3.0 (and backwards compatible) modem. It worked. I went from a 2mbps download speed to over 17mbps. What a difference. There was one installation glitch that you need to be aware of. When you hook up the modem (connect the coax cable, connect the ethernet cable, and plug it in, that's it), and then try to get online, it will direct you to a Comcast self-activation screen (no other site is available). After entering my account number and phone number and hitting the "next" button, I got a blank screen, and nothing happens. So I called Comcast and they said that usually happens if you are doing an upgrade; it mostly works only for a new service connection. However, it is a simple matter to give the tech your MAC address and the serial number. After about 5 minutes, while he stayed on the line, it came alive, no problem. BUT, here's the thing: the serial number they need is the CUSTOMER serial number. This is only found on the bottom of the Motorola box the modem came in. This is different from the "S/N" serial number that is on the label that is on the instruction sheet and on the bottom of the modem itself. The customer S/N has letters in it; the regular S/N has only numbers in it and is too long. My first Comcast tech didn't know that and it took a day to sort it out. Other than that, it works well with my iMac and Apple Airport Extreme Base wireless router. Enjoy

Link to modem: http://amzn.to/ApAfjg
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Peter Hanson

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The problem of periods of slow Internet speed is widespread, and not confined only to Comcast. The cable internet system is comprised of nodes that feed a given area, and when these nodes are assigened to customers by sales departments which, in the interests of job security, overbook the nodes. there are going to be speed problems. The obvious solution is to add additional nodes, but this costs money and affects "the bottom line." So it's easier simply to overbook and let the customers complain More sales means more bonuses for upper management. The same situation exists with cellphones and shared web hosting services. Bureaucrats aren't interested in "boring" subjects such as bandwidth capacity.