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10.4: Disable IPv6 networking for possible speed gain
Authored by: sighup9 on Sep 23, '06 06:35:34PM
There is something to slower download speeds on Macs...

I use http://myspeed.visualware.com/

From a PC laptop hooked up to a lowly 10 MB PCMICA Ethernet card, I consistently get:
3.54 Mbps down and 361 Kbps up

On my mini from either the AirPort or 1000BaseT, I got:
1.99 Mbps down and 361 Kbps up

I executed sudo sysctl -w net.inet.tcp.recvspace=65536 and got:
2.10 Mbps down and 361 Kbps up

I also disabled IPv6 and got:
2.22 Mbps down and 361 Kbps up

Still there's a big discrepancy (1/3 or better!) between download speed on a PC and my Mini (Aluminum 15" PowerBook gave similar results) and I'm trying to determine what other parameters might help. Any thoughts are appreciated.

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