[Speed] Comcast performance speeds fluctuate
I recently signed up for Comcast's Performance package (20mbps down). I've noticed extreme fluctuations in the internet speed. I've run a speed test at which it scored about 18mbps down, and then a minute later it scored 3mbps. It seems to be all over the place. One consistent thing I've noticed though is that whenever downloading large files (over 100mb) I always get 10-20mbps, but as soon as I'm done downloading, it's back down to 3-5mbps. Any ideas on how this can be fixed, or is this just how it is with Comcast?
»Comcast High Speed Internet FAQ »How To Get Help!
I'm in Provo, Utah. The speed fluctuations happen all day. I have a Motorola SB5101 modem with firmware version SB5101-184.108.40.206-GA-00-NOSH. I thought the issue may be my Cisco router at first, but I am plugged directly into my modem and still experience the speed problems. I'm running AVG 2012 (newest version). I have tested and found the problem on my Windows 7 PC and my Android phone, using both Firefox and Chrome browsers.
I'm subscribed to the Comcast Performance 20mbps down/4mbps up connection.
post your modem signals too
and I am pretty sure performance is 15/2
unless your area is different
Frequency 555000000 Hz
Signal To Noise Ratio 38.9 dB
Power Level 8.8 dBmV
Channel ID 11
Frequency 28000000 Hz
Power 47.2 dBmV
I got an upgrade to 20mbps, and I do reach those speeds every once in a while, it's just very inconsistent.
20 probably includes PowerBoost. You need to provide all the info requested above so we can help you. Speed tests and all.
Here are some speed tests I ran yesterday on speedtest.net:
I'll just list the download speed, because the upload speed always stayed about the same (around 4mb/s) and ping was always around 45 ms
2. 10.11 mb/s
3. 15.24 mb/s
4. 4.33 mb/s
5. 3.81 mb/s
6. 18.73 mb/s
7. 22.42 mb/s
8. 7.91 mb/s
This was all within an hour time period, and the speed fluctuates like this pretty much all throughout the day. I realize that it would be unreasonable to expect a constant 20mb/s as Comcast advertises, but I would think I should be getting pretty constant averages over 10mb/s. I contacted Comcast and the service rep just told me to reset my modem, which of course did not fix the problem. Any help here would be great.
Download/Run this and post the results: »www.cc.gatech.edu/~partha/diffpr···obe.html
DiffProbe release. January 2012. Build 1008.
Shaper Detection Module.
Connected to server 220.127.116.11.
Upstream: 1364 Kbps.
Downstream: 5464 Kbps.
The measurement will take upto 2.5 minutes. Please wait.
Checking for traffic shapers:
Upstream: No shaper detected.
Median received rate: 1344 Kbps.
Downstream: No shaper detected.
Median received rate: 5338 Kbps.
For more information, visit: »www.cc.gatech.edu/~partha/diffprobe
Time to call Comcast.
I was afraid of that. Any idea of what's causing the problem?
Faulty modem, some type of noise issue possibly... Speaking of modems, which one do you have ?
I've got the SB5101. It's on rental from Comcast.
Just go trade it in for a newer model modem. I did and all is good.
|reply to tmac |
Yeah, you need a newer modem.
I'm thinking about just returning the rental modem and buying my own. Any recommendations for a good one for the service I have (20mbps down/4mbps up)?
Also, has anyone had any experience returning a Comcast rental modem? I'm hoping they will just take it and take off the $7/month I'm paying to rent it, but I'm worried that it may have been part of my contract, and I may be forced to rent it until my contract is up (in a year).