Whenever I move my mouse, my Minecraft lags badly. What is wrong with it?

Answer 1

Its probably the computer you have. Some computers aren't as good with minecraft as others. But there are some settings to make your game a little less laggy. Turn the graphics off fancy, turn particles to "minimal" and turn you're vision option to short or tiny. Hope that takes some lag away

Answer 2

Hello Blockbuster,

I see your problem and it is simple. You are not allocating enough RAM to the server. Your solution would be to get a free software if you haven't called notepad++. I highly recomend it to any server owner; however,  you can also use regular notepad. Next, open up your file that contains your server's folders. Open up notepad++ (or notepad) and create a file with this in it.

@ECHO OFF
"%ProgramFiles%\Java\jre7\bin\java.exe" -Xmx3060M -Xms3060M -jar craftbukkit-1.5.2-R0.1.jar
PAUSE

IT MUST HAVE THE CORRECT SPACING!

save it as run.bat

MAKE SHURE IT IS A .bat FILE

close out your server and run the newly made .bat file and u should be fine. WARNING: this is for servers with 4GB of ram or higher. This is also only compatible with Windows and uses Java. 

Answer 3

if u change it to full screen it will help

Answer 4

Check your internet connection