Problem Mystcraft world

[Altentio]

Creating a mystcraft world and roaming in it crashes my server. I have 2Gigs ram allocated minimum and 4GB maximum but the java window shows 200mb (50% free) which indicates something is wrong... i have 16GB of RAM total btw.
I also get the world leaked problem

also i have tweaked my .bat file because earlier it wasn't working properly, and still isn't as i see.

@Echo off
"C:\Program Files\Java\jre7\bin\java.exe" -server -d64 -Xms1024M -Xmx4096M -jar ftbserver.jar
pause

 

[Claycorp]

I've had this happen on my server on 12G.
It has to do with how much world gen it has i believe the more complicated the world the harder it is on the server. Also lots of decay can slow or crash servers.
The only fix i can think of is make your world less "fancy"

 

[Altentio]

I've also found out a fix, should just post it here so this thread can get closed,
Fix: The "-Xms1024M" basically set my server max to that dunno why, but im not a specialist in java, once i set it both to 4096 the server max was increased and I'm experiencing no RAM lag anymore.

Hopefully this thread will be helpful to somebody. Even though the title is a bit misleading