How to I make a Minecraft server less laggy?

I want to know how to make my Hamachi Minecraft server less laggy I run the.JAR version of the Minecraft server thing not the.exe and I have I gaming PC

64Bit

I think 3.97 Gigahertz AMD A10 Elite Quad Core

8GB of ram

1TB of space

Guest

Hamachi was always very laggy when i hosted with it.
I also use the.Jar version, What i do is create an ip hosting name @ http://www.noip.com/
after i create a free hosted domain, i download and configure PortMap to Minecraft which is 25655
after that, it should all be working fine and people can log in to your server with just the free domain you register.

Lorensen

Use optifine and put all visual settings to low

Farhan