How did Apple speed up 802.11ac and AFP in 10.8.5?

I understand that Apple sped up 802.11ac networking and AFP (Apple File Sharing) with 10.8.5, primarily to benefit Mac Book Airs. I find, playing with 10.8.5 and later, that this is actually a general speed up of local networking that also benefits Ethernet transfers through a gigabit switch.
In particular I ran a test. I have two computers involved, each of which is dual boot between two OS versions. The server machine, which was accessed to retrieve a large multigigabyte file in the test, is a Mac Mini 2011 with Lion 10.7.4 and Mountain Lion 10.8.5. The client machine is a early 2011 MacBook Pro, with Snow Leopard 10.6.8, and Mavericks 10.9.1. All tests had both machines wired to a Netgear R7000 router featuring gigabit LAN prots with cat 5e cables.
Test Case 1: Client running Snow Leopard 10.6.8 connected to Server running Lion 10.7.4: I was able to copy a large multigigabyte file from the server at a rate of 1.43 metric gigabytes (base 1000) per minute, achieving a real word data transfer speed of 190 mbps, far below the practical limit of gigabit Ethernet.
Test Case 2: Client running Mavericks 10.9.1 connected to Server running Mountain Lion 10.8.5: I was able to copy a large multigigabyte file from the server at a rate of 6.23 metric gigabytes (base 1000) per minute, achieving a real word data transfer speed of 828 mbps, which I figure is about the practical limit of gigabit Ethernet.
My question, is what did Apple do to tune the networking in 10.8.5? Are there TCP IP parameters I can change in the older OS's so they can do Ethernet fast also? Parameters I can tune in sysctl.conf? I am hoping a real network guru can come on here to advise on some advanced techniques I can use, since I have eliminated any question of the speed of my router, my computers, or my hard drives by the results I achieved in Test Case 2.
There are reasons I want to keep the older OSs around and would like them to network fast also.
(Also, for any/all OS versions, are there networking parameters that I can tune to speed up transfers that involve a very large number of very small files?)
Thanks

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I am normally not a complainer, but rather appreciate great technology.
However, I am shocked beyond description about how badly Apple screwed up the maps application in IOS 6.
The maps application is the by far the most frequently used and most useful iphone application for me.
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Maybe its not going to be my thing, but I hope Apple realizes how big they screwed up.
The Apple of Steve Jobs would never, ever, ever have let this happen.
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I would not be surprised if this very deeply damages Apple at a time when the competition is getting tougher & tougher.
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I called the Kelly Moore store, and they told me the maps app has the wrong town, and they have had many customers with the same problem!
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I just can't trust their app, which is something I depend on every day to save me time, money and gas.
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When will Apple TV support 802.11ac?

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Greetings. I will be purchasing a new iMac that will support 802.11ac wi-fi and would like to take advantage of this by using the Apple AirPort Extreme but I'm not sure how. I currently have a modem (Cisco DPC3825) from my internet provider, which does not support 802.11ac. If I were to connect the AirPort Extreme to my modem (DPC3825) via an Ethernet cable and then (wirelessly) connect my new iMac to the netowrk, would I receive 802.11ac or just b/g/n still? In addition, when I connect the AirPort Extreme to my modem, will it create two networks (i.e. one network for the AirPort Extremem + my original wifi network) or can you merge it into one network? Hopefully what I'm asking makes sense. Thank you.

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+ Click the White Kudos star on the left as a way to say "thank you" for helpful posts.

Airport Extreme 802.11ac and USB disk failure

hi,
Had an Airport Extreme 5th gen with a USB disk attached for over a year of which my Mac was using Time Machine and creating backups no problem, didnt skip a beat.
Just bought a new Airport Extreme 802.11ac, attached the same USB disk and Time Machine works once or twice then fails saying it cant find the disk. True enough if I open finder and try and find the disk its not listed.
Opening the airport utility it shows the disk attached. If I reboot the Airport Extreme the disk shows up again in finder for a short period of time.
Looks like they released a firmware update 7.7.1 which was supposed to fix this but it seems in my case it hasnt. Even factory reset after the update but no joy.
Normal wireless activities like internet access etc are fine.
Not sure if anyone else has experienced this yet? If not I guess ill try a non self powered disk or something, either that my AE is faulty.
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How did Apple speed up 802.11ac and AFP in 10.8.5?

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