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how may users are on your server? you may need to dedicate more ram I recommend ~500M per user

I recommend adding-server -XX:+AggressiveOpts -XX:UseSSE=4 -XX:+UseFastAccessorMethodsI have seen -server reduce cpu usage by 20% on some systems sse is a data parallel instruction set, it can give a Huge speed boost if there is code that can use it, your cpu supports SSE4.2 so we tell it to...

so it looks like you need to have an admin account to use -XX:+UseLargePages you may have to start removing commands untill you get down to the ones you are allowed to use is disappointing that you cant use the -server option, I have seen it reduce cpu usage by 20% when running MC

the -server option is a standard feature there is no reason that it should be missing unless could you try using the full path and not the program files system variable?

yes actually its trivial @echo off "%ProgramFiles(x86)%\Java\jre6\bin\java.exe" -Xms1024M -Xmx1024M -server -Xincgc -XX:NewRatio=2 -XX:CMSFullGCsBeforeCompaction=1 -XX:SoftRefLRUPolicyMSPerMB=2048 -XX:+CMSParallelRemarkEnabled -XX:+UseParNewGC -XX:+DisableExplicitGC -Xnoclassgc...

you will want to look at this http://java.com/en/download/help/path.xml

add a second line "pause" that will keep the window open so you can see any error messages

copy, change the server_jar_name_here to the name of your .jar file. and remove all the newlines ( enter key) so it all fits on a single line in the .bat you will need to replace the current contentes of the .bat

Not every version of java supports all of the options They are listed as non standard

it looks to me like the server is trying to put you in an invalid location you can have your user.dat file removed from the server, the only problem being when you get back in your inventory will be empty and you would be back at spawn of you could try editing the .dat to change location, I know...

you can try launching the server with this (goes in the start_server.bat) please note that the command needs to be on a single line, it is spaced out so I can read/tweek it. also make sure you set your server jar name correctly If any of that sounds condescending Im sorry but these are problems...

Are you running the client and server on the same computer? edit: then I will have something for you to test in 5min

how much ram do you have allocated to your client look in the options tab in the launcher, you will probably need it set to something like 2 gig one thing you can do in game is when its starts lagging hit f3, and look in the top right-hand corner, it will tell you how much of its currently...

posting the crash log would be helpful

what cpu do you have, how many cores, how much ram, what operating system if your on windows, start menu-> computer (right click)->properties -> info!!!

you will need to get the server admin to look over the logs. there should be more information there perhaps have them post anything they find to this thread

can you post your system specifications?

On one system I profiled it was almost 50% However that was a vinilla server, and several months ago

if your having trouble please post the error message, your system specks (ram cpu operating system), the command line your using then open a terminal or command prompt and run java -version

jojo please post your system specks, ram cpu etc. then open the terminal or command prompt and run java -version also post the error message.