Wireless downloads slower with BT Infinity

I recently upgraded from BT Broadband (ADSL2+ with BT Home Hub 1.0) to BT Infinity. I installed and switched over to the new BT Home Hub 3 before the BT Openreach engineer came, as I was worried about how wireless networking would work as the Hub had to be in a different location from the previous one.
I then ran some Broadband performance tests http://speedtester.bt.com/ to see how well the new arrangements worked. The upload speeds from my main PC (with a wireless N adapter) were in the previous range of 700 – 800 Kbps. The download speeds on average seemed a little slower than before at the 5 – 7 Mbps range, although I did achieve a new peak of 11 Mbps in the late evening.
After the switchover to BT Infinity, I ran the tests again. The upload speeds were very consistent and in the 7 – 8 Mbps range. The download speeds were in the 3 – 7 Mbps range, with most towards the lower end of this range.
I also ran a test late in the evening using a Netbook with an Ethernet connection to the Hub. This slightly exceeded the expected speeds for the BT Infinity service, with over 8 Mbps for uploads and over 35 Mbps for downloads. On the old Hub with the Netbook and Ethernet connection I had got 670 Kbps for the upload speed and over 12 Mbps for the downloads.
Does anybody know why the wireless download speeds reduced after the switchover to BT Infinity? Is it a settings issue, a software bug, some other fault, or a feature of Home Hub 3 and BT Infinity? It does seem very strange that the upload speed over a wireless connection is faster than the download speed, as well as being much more consistent.

RChilton wrote:
I recently upgraded from BT Broadband (ADSL2+ with BT Home Hub 1.0) to BT Infinity. I installed and switched over to the new BT Home Hub 3 before the BT Openreach engineer came, as I was worried about how wireless networking would work as the Hub had to be in a different location from the previous one.
I then ran some Broadband performance tests http://speedtester.bt.com/ to see how well the new arrangements worked. The upload speeds from my main PC (with a wireless N adapter) were in the previous range of 700 – 800 Kbps. The download speeds on average seemed a little slower than before at the 5 – 7 Mbps range, although I did achieve a new peak of 11 Mbps in the late evening.
After the switchover to BT Infinity, I ran the tests again. The upload speeds were very consistent and in the 7 – 8 Mbps range. The download speeds were in the 3 – 7 Mbps range, with most towards the lower end of this range.
I also ran a test late in the evening using a Netbook with an Ethernet connection to the Hub. This slightly exceeded the expected speeds for the BT Infinity service, with over 8 Mbps for uploads and over 35 Mbps for downloads. On the old Hub with the Netbook and Ethernet connection I had got 670 Kbps for the upload speed and over 12 Mbps for the downloads.
Does anybody know why the wireless download speeds reduced after the switchover to BT Infinity? Is it a settings issue, a software bug, some other fault, or a feature of Home Hub 3 and BT Infinity? It does seem very strange that the upload speed over a wireless connection is faster than the download speed, as well as being much more consistent.
Dont know about that, but I have had my Infinity for a year now, and the guy who set it up said, that if I go wireless, then my speed will drop.

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MacBook Pro (13-inch, Early 2011) (Verified)
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1 2.7 GHz Intel Core i7 CPU: 2-core
4 GB RAM Upgradeable
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OS X 10.10 (14A389) - Uptime: 14:53:8
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Hitachi HTS547550A9E384 disk0 : (500.11 GB)
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Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. FaceTime HD Camera (Built-in)
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
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/System/Library/Extensions
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Mobile backups: ON
Auto backup: YES
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Macintosh HD: Disk size: 498.88 GB Disk used: 155.18 GB
Destinations:
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Total number of backups: 106
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EtreCheck version: 2.1.8 (121)
Report generated 8 March 2015 1:41:06 pm AEDT
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Internet Plug-ins: ℹ️
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    Auto backup: YES
    Volumes being backed up:
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    710 MB    Wired RAM
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    Mar 7, 2015, 03:24:57 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Pages_2015-03-07-152457_[redac ted].crash
    Mar 5, 2015, 10:20:58 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/cloudd_2015-03-05-222058_[reda cted].crash
    Mar 5, 2015, 10:14:51 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/cloudd_2015-03-05-221451_[reda cted].crash
    Mar 5, 2015, 10:14:42 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/cloudd_2015-03-05-221442_[reda cted].crash

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