The following steps can help improve your machine's network performance. One way to improve your machine's network performance is by adjusting the TCP windows and using a better congestion control algorithm. In addition to improving network performance, it may be necessary to prepare your environment for using Kubernetes as well.

To change the network congestion algorithm, here is an article about it: Huge improve network performance by change TCP congestion control to BBR.

sudo sh -c "cat >/etc/modules-load.d/bbr.conf" <<EOL
tcp_bbr
EOL

Prepare for Kubernetes

sudo sh -c "cat >/etc/modules-load.d/kubernetes.conf" <<EOL
br_netfilters
overlay
EOL

you may also want to install and enable fuse

sudo apt update && sudo apt install fuse
sudo sh -c "cat >/etc/modules-load.d/fuse.conf" <<EOL
fuse
EOL

Adjust the TCP window size

sudo sh -c "cat >/etc/sysctl.d/99-network-finetune.conf" <<EOL
net.ipv4.tcp_congestion_control = bbr
net.core.default_qdisc = fq

net.core.wmem_max=125829120
net.core.rmem_max=125829120
net.ipv4.tcp_rmem= 10240 87380 125829120
net.ipv4.tcp_wmem= 10240 87380 125829120
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_no_metrics_save = 1
net.core.netdev_max_backlog = 10000
EOL

sudo sh -c "cat >/etc/sysctl.d/99-kubernetes.conf" <<EOL
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOL