Really strange network issue that is specific to OS X 10.6.8

Really strange network issue that is specific to OS X 10.6.8 on both 2 iMacs and an older intel Mac Pro.
Any system running 10.6.8 is achieving on average 15 –20 mb a sec transfer rates regardless of drive speeds, cables, network activity etc.. I've spent some time removing any cable , drive speed, router issues to the point where one machine dual boots into both 10.6.8 and 10.6.5
The 10.6.5 system has network speeds of 60mb – 80mb p/sec transfer rates.
Our older 10.5.8 PPC mac gets 80mb and my 2011 Macbook Pro 10.7.2 hits 60mb – 80mb consistently as well.
Any idea what the cause is?
Cheers

Since your other Mac running 10.5.8 is not affected, you know that your AirPort router is functioning correctly.
What changed on your Mac? This seems like a post for either the Mac OS X v10.6 Snow Leopard support area, or the support area for your model of Mac.
We normally handle questions about the AirPort Express, AirPort Extreme or Time Capsule in this area, but you can certainly wait to see if you receive a response here.

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    This posting is provided with no warranties and confers no rights.
    Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread.

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