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Optimize your broadband internet connection Apps
Broadband Optimizer for OS X claims to optimize your network settings for broadband connections (like cable modems) to the Internet. There's some discussion of this program and the results obtained with it on the Ars Technica Networking Forums.

[Editor's note: I downloaded and installed this package. It's a very benign installation - a folder which sits in your /Library/StartupItems folder, and sets four different TCP values. To remove it, just remove the folder and restart. If you have a broadband connection, it can't hurt to give it a try. My test results were interesting. I ran the speed tests from, and I also looked at Quake3 ping times. My download speeds seem to have dropped slightly since installting the package, but my Quake3 ping times are notably (and repeatably) lower. I'll keep an eye on it over the next few days and see how things go with both downloading and Quake3 before I decide whether I'll keep this package or not.]
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Optimize your broadband internet connection | 3 comments | Create New Account
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Didn't work for me
Authored by: DavidRavenMoon on Nov 23, '01 12:36:07PM

I tried this and my speed was lower with it. Without it I tested at 2746 kbps d/l and 1034 kbps u/l on using @Home cable connection. With the tweak I got only 790 kbps d/l and 763 kbps u/l.

However, then I tried the "sudo sysctl -w net.inet.tcp.recvspace=65536" Terminal command, and tested again, and I got 2777 kbps d/l and 1047 kbps u/l

YMMV... reports from VersionTracker seem to show this works for most people.

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Didn't work for me
Authored by: silverghost on Nov 24, '01 04:11:37AM

just a comment the second variable is the same as the one the program replaces.


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Optimize TCP
Authored by: mnewman on Mar 12, '02 06:37:57PM

I've got a small LAN with an Airport. I'm using the Airport to dial up my ISP and to do NAT to share the connection and provide wireless access for an iBook. I have an old 7500 running 9.1 on which I use IPNetTuner to optimize Open Transport. I use the supplied "Download and Browse" configuation file which does a good job of allowing me to continue to browse the web while downloading files. It does this by tweaking OT parameters.

The iBook is running 10.1.3. When I'm downloading a file on this machine, other TCP clients become next to useless until the download is done. Somehow the TCP stack under OS/X is unable to equitably allocate bandwidth to more than one TCP client at a time.

Does anyone know what TCP parameters need to be adjusted to optimize OS/X in the same way that OTNetTuner optimizes OT on OS/9?

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