If you have the TCP/IP settings set to configure themselves automatically (which is how mine are and most people's are), that could be causing the delay.
You can configure a manual IP address of 220.127.116.11 (you can put whatever numbers you want as long as each one is between 0 and 255) and a default subnet mask of 255.255.255.0. The other computers on your network each can use a different IP address in the same class, such as 18.104.22.168, 22.214.171.124, 126.96.36.199, and so on. This way, each computer has a permanent IP address. Note that if you change the IP addresses of your computers, they must all use the same subnet mask.