You can increase the network performance by override the default settings:
cat /etc/sysctl.conf
vm.swappiness = 10
vm.vfs_cache_pressure = 500
net.core.netdev_max_backlog = 4096
net.core.wmem_max = 1048568
net.core.rmem_max = 1048568
net.ipv4.tcp_wmem = 8192 32768 2027520
net.ipv4.tcp_rmem = 8192 131072 2027520
net.ipv4.tcp_mem = 32768 98304 131072
net.core.optmem_max = 32768
To the meaning of them, please check in man.
