From: "Rich Gauszka" 

someone mentioned he got an improvement with ( it's disabled by default for Vista )

 netsh interface tcp set global congestionprovider=ctcp

http://www.microsoft.com/technet/network/evaluate/new_network.mspx

Compound TCP
For TCP connections with a large receive window size and a large
bandwidth-delay product (the bandwidth of a connection multiplied by its
delay), Compound TCP (CTCP) in the Next Generation TCP/IP stack
aggressively increases the amount of data sent at a time by monitoring the
bandwidth-delay product, delay variations, and packet losses. CTCP also
ensures that its behavior does not negatively impact other TCP connections.
In testing performed internally at Microsoft, large file backup times were
reduced by almost half for a 1 Gigabit per second connection with a 50
millisecond round-trip time. Connections with a larger bandwidth-delay
product can have even better performance.

Receive Window Auto Tuning optimizes receiver-side throughput and CTCP
optimizes sender-side throughput. By working together, they can increase
link utilization and produce substantial performance gains for large
bandwidth-delay product connections.

CTCP is enabled by default for computers running Windows Server
"Longhorn" and disabled by default for computers running Windows
Vista. You can enable CTCP with the netsh interface tcp set global
congestionprovider=ctcp command. You can disable CTCP with the netsh
interface tcp set global congestionprovider=none command.



"Geo."  wrote in message
news:459c4472$1{at}w3.nls.net...
> I've now confirmed that lots of people are seeing 5mb transfer rates with
> vista over gigabit networks.
>
> http://www.neowin.net/forum/index.php?showtopic=519457&st=30
>
> that's my problem exactly, I've tried everything they suggested, nothing
> worked so far.
>
> Just as a test, while transferring 18 gig of files I tried to browse the
> internet and it browsed really really slow (like 2 minutes to bring up a
> page) while browsing from my other laptop on the same network was quick
> and crisp as ever.
>
> it's definitely in vista, hard drive barely flickers so I don't think it's
> HD speed, cpu is 5%, plenty of memory free..
>
> Next I'm going to completely uninstall IPv6 and the QOS provider.
>
> Geo.

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