Slow wired and wireless connections on new Mac Pro

I have a new 6-core Mac Pro with 64GB RAM that I seem to be having major network issues with. When I restart or first switch the machine on it's fine but after a few minutes the network (web browsing) become painfully slow - when I run a speed test it come out at ~2Mbit/s. This is the same whether I connect on a wired or wireless connection. I've tried various connections including a complete bypass of my time capsule to a direct wall connection that should be giving 100Mbit/s. When i run a speed test on my iPhone connected to the time capsule via 5GHz I comfortably get >60MBit/s.
Is there a bug in the latest OS 10.9.4 my MBAir also seems to require a lot of restarting to keep up even basic web browsing???

Your Macs are always looking for a better connection. To that end, they are evaluating every possible way to get to the Internet.
It is very important that you limit those choices to only the ones you actually want to connect to, and indicate that the other are "off the list", literally.
For example, to test your wired network connection, Ethernet must be at the top of the list AND WiFI must be OFF. (Otherwise, your Mac will be checking WiFi to see if it seems to be getting a better connection over WiFi. In the screenshot below, Ethernet is at the top of the list, so it is likely to be used, but since WiFi is still ON, it may be used instead.
To check YOUR WiFi connection (and not your neighbors' connections), you need to BOTH check that the "ask to Join new Networks" box is checked:
and that the Networks you wish to join are shown in the order you wish to join them. All extraneous networks should be removed from this list:

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This question was solved.
View Solution.

Hi,
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