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OSX - Tuning the Network Stack TCP
## Quick fix for slow internet after update to OSX 10.11 "El Capitan"
## Changes are not permanent, just restart your mac if it doesn't work.
## write config
sudo su -
sysctl -w net.inet.tcp.doautorcvbuf=0
sysctl -w net.inet.tcp.doautosndbuf=0
sysctl -w net.inet.tcp.win_scale_factor=0
# net.inet.tcp.recvspace=1048576
# net.inet.tcp.sendspace=131072
## optional setup
# sysctl -w net.inet.tcp.recvspace=1048576
# sysctl -w net.inet.tcp.sendspace=131072
## read config
sysctl net.inet.tcp.doautorcvbuf
sysctl net.inet.tcp.doautosndbuf
sysctl net.inet.tcp.win_scale_factor
sysctl net.inet.tcp.recvspace
sysctl net.inet.tcp.sendspace

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csujedihy commented Aug 3, 2017

it will only slow down your network speed due to shallow buffer.

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