BT Infinity speeds: Inconsistent and sluggish at t...

So we had fibre installed last week, great, everything was fine. The guy told us to do a speedtest after installing it, and this is what we got: http://speedtest.net/result/2755886052.png - perfect, exactly what we wanted. The next few days proved to be fine, the internet didn't drop out, speeds didn't fluctuate more than about 5mb below 75mb on the downstream (upload has never been slower than about 15.5mb since fibre). However, since Friday night and soon after, the internet speed has fluctuated dramatically. 
At the moment, we seem to be seeing download speeds range from 10mb to 75mb, whats causing this? We did begin to recieve some drop out issues on Friday, but an engineer came out on Tuesday and fixed some problem with the wiring. Since then, it hasn't disconnected, but the speed has been unaffected by it. Doing a BT speed test just now, this was achieved: http://i.imgur.com/iiLIJjM.jpg, and this is what we get on speedtest.com: http://speedtest.net/result/2769310113.png Before anyone asks, yes, I did check that there was no traffic conjestion on the line (wireless was switched off and I made sure no one was downloading/streaming/uploading anything, myself included). 
Now we were told to expect around 70mb, and before Friday, the internet seemed to deliver that with ease. If I were to download anything, I would get consistent speeds of about 9.3mb/s; wonderful. Unfortunately, at the moment, I can only get similar speeds in the mornings. This was a speedtest from earlier this morning: http://www.speedtest.net/result/2768168225.png I think the problem may lie with possible peak times? Which I think is very unacceptable considering what we're paying for, and a lot of the time right now we're not even getting the minimum 1/3 of the estimated speed. Which in this case would be around 25mb.
I also understand that we're still under the 10 day stability period, I'm just concerned that our speed is being hindered somewhat. Oddly, it's only the downstream that is affected, the upstream and ping have been very consistent, and don't seem to fluctutate at all. Now of course the internet is going to fluctuate when people use it, and of course, when taking these speeds I did make sure there was minimal traffic (if not no traffic) on the line. 
If someone could investigate this situation, I would be very thankful.
Thanks in advance, 
Liz 
Edit log: fixed one of the broken hyperlinks.

I have the same situation... however I think the issue is actually not your connection to the internet, but rather the contention on the Speedtest and BT Speedtest servers as the day progresses. (i.e. more and more people hitting them.)
We have 100/100 MB connection at work and we get the same degrading speed on Speedtest as the day progresses, i.e. we have no contention on our fixed line.
Some Speedtest servers are better than others of course...
My home Infinity can go from 310 down to 80 on the fastest Speedtest servers I use (Uno/Milton Keynes or Virgin Media Croydon) between 07:00 to 12:00+, so you are not alone.
The best thing to do is download big files from Adobe or Apple and check the actual speed, e.g. try before you by install files. These are on Akamai cached server clusters and so don't suffer from contention and you can see the real speed of your service.
Good luck
Be a first rate version of yourself, not a second rate version of someone else

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    FiXiT wrote:
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  • Post Moved Infinity-speed

    Post moved to infinity http://community.bt.com/t5/BT-Infinity/Infinity-speed/td-p/666668
    If you want to say thanks for a helpful answer,please click on the Ratings star on the left-hand side If the reply answers your question then please mark as ’Mark as Accepted Solution’

    I was going to put it in the Infinity forum but as there were other similarish ones here, and that my problem is reagrding a connection issue (my modem gets Inifinity just fine), I thought thought the connection issues forum would be the correct place.
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    jac_95 | BT.com Help Site | BT Service Status
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