Hello, I just recently re-installed the OS on the PC running the minecraft server to Windows 7 64bit. I had installed the 32bit version of Java so I had to go back and get the 64bit version. The PC is an old Phenom 9850BE (2.5ghz/quad core) and it has 4GB of RAM. Going through the forums, I found different startup lines and I'm currently using this: Code: @echo off "C:\Program Files\Java\jre6\bin\java.exe" -XX:+UseLargePages -Xms2g -Xmx2g -XX:+UseParallelGC -XX:ParallelGCThreads=4 -Djava.net.preferIPv4Stack=true -jar CraftBukkit.jar nogui pause I don't understand a lot of those switches, I just copied what people said it worked for them. What are the best Java switches to get the most of the hardware? When I start the server, I get this line at the top: Java HotSpot(TM) 64-Bit Server VM warning: JVM cannot use large page memory beca use it does not have enough privilege to lock pages in memory.