in macOS edited January 2014
i've just installed the program and i was wondering what are the appropriate settings for my DSL connection which is at 384k

the defaults are

net.inet.tcp.sendspace: 65536

net.inet.tcp.recvspace: 65536

net.inet.tcp.delayed_ack: 0

net.inet.udp.recvspace: 73728

which setting do you suggest me to change or just leave it as it is.



  • Reply 1 of 2
    humanhuman Posts: 3member
    I have a similar question as the author of this forum-thread asked. Do any of you, readers know how to properly use the BroadBandOptimizer 1.5 program to speed-up the transfer of files, as fast as possible on an iMac G5 or any other Mac desktop-computer?
  • Reply 2 of 2
    lundylundy Posts: 4,466member
    BBO is for the connection you have, not the computer.

    All it does is set values in BSD, and set the startup file to do them on every boot.

    The values that it sets are for people with very fast connections - like FiOS.

    If you don't have that kind of connection it won't do much of anything.

    Test out changing the settings by going to Terminal and typing

    sysctl net.inet.tcp.recvspace

    To see what your receive window is.

    If you want to change it, type

    sudo sysctl -w net.inet.tcp.recvspace=NNNNNN

    Where NNNNNN is the new receive window value. If your original one was say, 64000 or thereabouts, try 384000 and then see if you can tell a difference in download speed (download a huge file like and watch the speed in Safari's Download window).
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