Increase network throughput

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On some operating systems, the default network settings limit the possible TCP throughput. If you find that your Linux VM is not able to push more than 20 MB/s on a gigabit port, then open /etc/sysctl.conf in an editor and add at the bottom:

net.ipv4.tcp_rmem=4096 87380 16777216
net.ipv4.tcp_wmem=4096 65536 16777216

Once saved, execute sysctl -p and try a test download.