The website I got it from was :
http://www.speedguide.net/tcpoptimizer.php
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Some more information from a test I just did (after amending my settings to match those of the other PC) :
1. Your Tweakable Settings:
Receive Window (RWIN): 256960
Window Scaling: 2
Path MTU Discovery: ON
RFC1323 Window Scaling: ON
RFC1323 Time Stamping: ON
Selective Acks: ON
MSS requested: 1460
TTL: (less any hops behind firewall) 127
TTL remaining: 118
TOS/TOS subfield: 0
TOS/Flags:
2. Test 1024001 byte download
Actual data bytes sent: 1040061
Actual data packets: 714
Max packet sent (MTU): 1500
Max packet recd (MTU): 1500
Retransmitted data packets: 11
sacks you sent: 170
pushed data pkts: 99
data transmit time: 5.456 secs
our max idletime: 464.9 ms
transfer rate: 167353 bytes/sec
transfer rate: 1338 kbits/sec
This is not a speed test!
transfer efficiency: 98%
3. ICMP (ping) check
Minimum ping: 78.64 ms
Maximum ping: 89.46 ms
Ping stability:
82.37 83.27 88.42 80.43 89.46 83.60 80.28 86.44 79.43 78.64
These results all came from the following test :
http://www.dslreports.com/tweaks
Having run the test and looking at the results, you have to select you "Service" (which I selected "cable"), Your advertised speed (kbit/s) (which I selected "2000"), your operating system (Mines XP Pro) and Connection (I chose "Normal")
The results above are almost exactly the same on both ours PC's now.
Darren