Does anyone know of a utility similar to SpeedGuide.net's TCP Optimizer or some other way to accomplish the same thing on Mac OS X (preferably with Snow Leopard)?

Screenshot of TCP Optimizer Application running

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You can always check out any Linux based howto on this topic, Mac is also only a Unix system. Most guides you'll find online are targeted towards servers (although Mac based servers are really rare). The following was taken from ESnet:

Apply these settings to /etc/sysctl.conf, and reboot: # set this for hosts connected at 1GE or higher net.inet.tcp.win_scale_factor=8 # for 10G hosts it would be nice to increase this too, but # 4G seems to be the limit for some OSX installations kern.ipc.maxsockbuf=16777216

For a more in-depth discussion of the topic check the following lengthy post Performance Tuning the Network Stack on Mac OS X.

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