Unusual Speed Problem
 

I'm having a very odd problem.

I can download multiple files at the same time, lets say 10, with the speed reaching around 18-19 Meg but none of them will download any faster than 700kb/s, even if it's just 1 file at a time. Not to mention that 700kb/s is the fastest I've got so far. Browsing is also a pain because of this slowdown.

I've done my virus and spyware scans, restarted the modem etc but nothing seems to make this work right.

I've run a couple of speed tests with the results below:


BBMax

Date of Speed Test: 2008-07-30 20:56:06

Download Speed: 1334 kbps (166.8 KB/sec transfer rate)

Upload Speed: 661 kbps (82.6 KB/sec transfer rate)


Speed Test

Test 1: 1024K took 8125 ms = 126 KB/sec, approx 1038 Kbps, 1.01 Mbps
Test 2: 1024K took 9672 ms = 105.9 KB/sec, approx 873 Kbps, 0.85 Mbps
Test 3: 1024K took 6438 ms = 159.1 KB/sec, approx 1311 Kbps, 1.28 Mbps
Test 4: 2048K took 15469 ms = 132.4 KB/sec, approx 1091 Kbps, 1.07 Mbps

Overall Average Speed = approx 1078 Kbps, 1.05 Mbps


Waited 15 mins and tried again...


Wed, 30 Jul 2008 19:11:48 UTC

Test 1: 1024K took 5719 ms = 179.1 KB/sec, approx 1476 Kbps, 1.44 Mbps
Test 2: 1024K took 4765 ms = 214.9 KB/sec, approx 1771 Kbps, 1.73 Mbps
Test 3: 1024K took 5922 ms = 172.9 KB/sec, approx 1425 Kbps, 1.39 Mbps
Test 4: 2048K took 20516 ms = 99.8 KB/sec, approx 822 Kbps, 0.8 Mbps

Overall Average Speed = approx 1374 Kbps, 1.34 Mbps



Any ideas about what's going on?

Re: Unusual Speed Problem
 

Where are you downloading from? Most servers aren't optimised to provide a full 20Mb download speed.

The fact that you can achieve 20Mb in total by downloading multiple files simultaneously indicates there is nothing wrong with your connection.

Re: Unusual Speed Problem
 

It doesn't matter where I download from, be it from Virgin Media, Microsoft or elsewhere. Just last week it was working fine at 1.8 - 2.2Mb/s but now it has dropped to what you see in the results above. Streaming videos is next to impossible, browsing is a pain but still multiple downloads work out fine.

Like I said, it's an unusual speed problem.

Re: Unusual Speed Problem
 

Im on 20mb and i have the exact same problem. Concurrency will give me full speed but that aint worth crap when your trying to watch something stream.

So i dont agree that the connection is working properly at all, it looks like throttiling or shaping or management, whatever you want to call it.....



what a godawful product/service.... really :(

Re: Unusual Speed Problem
 

Not sure if this is along the same lines but as of about 5 weeks ago my level of service has taken a nose dive. My symptoms: Web browsing, email, IM, Skype etc all work fine but the moment I try and download something like a podcast or software patch the connection keeps dropping. I've been through the useless tech support who had me go throrgh the various switch off cycles and then told me everything was OK and that I didn't have a problem!!!!

Any hoo - looks very much like traffic management or throttling to me, which is very annoying as I'm on a higher bandwidth package and I'm not really a high data consumer - the only time I do more than email, IM, web or skype is when Itunes tries to grab my weekly podcasts or I need to download a software update.

Been with NTL since 2000 and hence virgin since the re-brand and have never had any cause for complaint. The service now sucks big time and I really can't see how to get it sorted if the tech support people refuse to accept I have an issue.
Time to move to ADSL I thinks.

Re: Unusual Speed Problem
 

hi, i hasd this problem, do a google search for tcp optimizer and then crnak it up to 20000 kbps, worked for me! :D

Re: Unusual Speed Problem
 

You could try this below if you are on XP.

TCP Optimiser is actually on the Virginmedia website click on this link and read about it.

http://help2.virginmedia.com/help/ge...anced_optimise

Then the link to the Speedguide site

www.speedguide.net.

Or the link direct to the Optimiser.

http://www.speedguide.net/downloads.php
------------------------------------------------------------------------------
You could try this below if you are on Vista

http://www.speedguide.net/read_articles.php?id=2574

Re: Unusual Speed Problem
 

@whydoIneedatech and ruddock08 - Thanks for the tips.

I'm actually on a mac here so I'll ask The Google about an OSX equivalent to TCP Optimiser.

BTW- the virgin media help page quoted won't load for me!

Re: Unusual Speed Problem
 

try here
http://www.speedguide.net/faq_in_q.p...ory=89&qid=129

Re: Unusual Speed Problem
 

I've run TCP Optimizer before and I ran it again after it was suggested in here. The browsing problem still exists, streaming videos are loading at 56KB/s according to a bandwith monitor I've been using for a few days to see how slow it's going. Sites load even slower than that, I try to use picture heavy pages to check the loading time to get a good reading.

In fact I took a screenshot of a YouTube video with the bandwith monitor overlayed to show the speed. It played from the start so the play meter shows how much has loading in almost 45 seconds.

https://www.cableforum.co.uk/images/...2008/08/22.png

Now for a proper download:

This is when I have numerous downloads running at the same time :-

https://www.cableforum.co.uk/images/...2008/08/23.png

and when I pause all but one of them :-

https://www.cableforum.co.uk/images/...2008/08/24.png

Re: Unusual Speed Problem
 

Tried all the tweaks but absolutely no change in behavior.

I have no problems over any other network.

I need to find who to speak to at VM 'cos I keep ending up with tech support who tell me there is nothing wrong!!!

This is getting really ridiculous. Not only am I not a high bandwidth user but the behavior isn't limited to peak times.

I am now having to use my 3G dongle to get my podcasts!

Re: Unusual Speed Problem
 

I contacted Virgin once again about my problem and they told me that everything was working as normal. However, this hasn't been the only time I contacted them about speed troubles and had them check my modem... this time was different as the guy on the phone said that my modem (ntl:home 200) doesn't support full 20meg and that he had ordered a new Ambit 256 for me to sort out the problem.

I recorded the power levels to tell them about it as I thought there was a problem there but he said they were fine. I've posted them below to see if people agree.


Ambit ntl:home 200

Downstream Receive Power Level : -5.7 dBmV
Downstream SNR : 30.5 dB
Upstream Transmit Power Level : 61.0 dBmV (I read that this was high or maximum)
Upstream Symbol Rate : 2560 Ksym/sec
Upstream Frequency : 29200000 Hz

Re: Unusual Speed Problem
 

Have you tried contacting the virginmedia.support.broadband newsgroup? I've had nothing but exceptional service from them.

http://www.virginmedia.com/customers/newsgroups/

Re: Unusual Speed Problem
 

I rather doubt replacing the modem will lower that Upstream from that high figure and you probably will still have the same issue.

Re: Unusual Speed Problem
 

shouldnt you have the power levels lowered well the upstream as that is a little from what I have seen