How can you get more memory on a Minecraft server?

Answer 1

Depends if your hosting, or a hoster is. Usually, you get more memory by upgrading your hardware, or if a hoster is hosting, buying more expensive servers.

If your hosting the server then you can look at Minecrafts download page and download the Minecraft_server.jar and it tells you how to make the server use more Ram then it defaults to via th ecommand line. It also has a link in the description to the Minecraft Wiki for a huge amount of info for server tweaks. If you have a low end broadband adding ram won't make the lag any better.