Tune /etc/sysctl.conf to speed up network connections to server

sysctl.conf

# Basic BBR Settings
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr

# Buffers 
net.core.rmem_max = 12582912
net.core.wmem_max = 12582912
net.ipv4.tcp_rmem = 4096 87380 12582912
net.ipv4.tcp_wmem = 4096 16384 12582912

# Optimization for high-speed networks
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_notsent_lowat = 16384

# Timeouts
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_time = 600