Fast speeds at first but slows down quickly

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twlehew
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Joined: September 15th, 2011, 9:18 pm

Fast speeds at first but slows down quickly

Post by twlehew »

I go to speedtest.net and get a download speed of about 25Mbps which is about right for my subscription with my internet provider, but when I go to download something through SAB it will start at 3.0MBps which is how I feel it should stay but it drops to 1MBps within about 1 minute and stays there. If I pause the download and restart it the same thing will happen. It seems like it's being throttled. I have my max download speed set in the config to 5,000 Kbps so I know that's not the problem. Is there anything else that could cause this?
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sander
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Joined: January 22nd, 2008, 2:22 pm

Re: Fast speeds at first but slows down quickly

Post by sander »

When you use another NZB-download-program instead, how does the download speed behave?

FWIW: another NZB-download program could nzbget (Linux, Windows, probably Mac): a bit raw, but very efficient.
fenlander
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Joined: May 4th, 2010, 5:47 am

Re: Fast speeds at first but slows down quickly

Post by fenlander »

Traffic shaping by your ISP can look like this. What happens if you try downloading late evening?
Hallars
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Joined: September 18th, 2011, 10:59 am

Re: Fast speeds at first but slows down quickly

Post by Hallars »

Well I have got 50M Speed acheiving 30-40M yet my download speed is 700k max through SABnzbd and Supernews Server... Why is this? Cheers
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shypike
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Re: Fast speeds at first but slows down quickly

Post by shypike »

Check the standard things:
- Did you set an article cache in Config->General? (Use -1 if you have plenty of memory).
- How many servers and server threads are you using?
- Are you using wired or wireless networking?
- You are aware that SABnzbd show the speed in MBytes/sec, while you ISP talks about Mbits/sec?
- You're sure your ISP doesn't do traffic shaping?
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jcfp
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Joined: February 7th, 2008, 12:45 pm

Re: Fast speeds at first but slows down quickly

Post by jcfp »

On irc, the same stuff came up, turned out it was their isp throttling usenet. See this thread if you are a virgin media customer.
twlehew
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Joined: September 15th, 2011, 9:18 pm

Re: Fast speeds at first but slows down quickly

Post by twlehew »

I'm using wired connection with article cache set to -1. I'm using 40 servers through giganews (I have tinkered with this multiple times with no changes.)
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sander
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Re: Fast speeds at first but slows down quickly

Post by sander »

twlehew wrote:I'm using wired connection with article cache set to -1. I'm using 40 servers through giganews (I have tinkered with this multiple times with no changes.)
Start by *lowering* the number of newsserver connections to 5.
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