Too much lag!

What i have it is not really a problem but i have too much lag in my server.I mean when i am alone everything is fine but when my friend logs in it lags in an extremely high level.Is there a way to reduce the lag in my bukkit server?I host this server with no-ip.com if that helps

 

Increase the ram. Reduce Render Distance, remove items laying on the floor. Reduce lava, water, amount of lighting. The list is endless. Also how many plugins do you have??

 

I have about 20 plugins but i tried to run the server without them but there was still lag. By the way how can i increase the ram?

 

if you're using Java x64 you can simply replace -Xmx with -Xmx2G or whatever to your running script. If you're using Java x86 you can only use up to 1500M (instead of the 2G).

 

1500mb is only a little over a gig.

 

I know, but x86 cant handle more. So it's worth using x64.

 

How can i replace and where is -Xmx?

 

Im having the same problem as soon as ten people come on the lag gets unbearable

 

Why do players keep getting kicked out of my server with the following message: Connection Lost Internal Exception:java.net.SocketTimeoutException:Read timed out

 

Slow internet
Slow CPU
Probably playing off same PC as you host on
Homehosted
Homehosted
Homehosted

List goes on....