Make sure your kernel is 4.9 or newer and issue the following single command (copy and paste all of it into your SSH terminal):
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf \&& echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf \&& sysctl -p && sysctl net.ipv4.tcp_congestion_control


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