Minecraft Forums

I've recently upgraded to a new computer with windows 8, with much better specs than my old computer (which ran Minecraft fine on relatively high settings); however this computer seems to be having a problem with Minecraft. I'll be able to play on max settings very smoothly for 10 - 15 minutes no problem, but then out of nowhere it'll start lagging to a point where it becomes unplayable. Any help would be appreciated, thank you.

Edit: Adjusting in-game graphics settings doesn't help at all, and I'm not currently running any mods.

My computer specs:

Quote from Tedster

Hmm...
If you don't have 64-bit Java, then you should delete your 32-bit version and install 64-bit. This solves the problem for a lot of users.

Or try launching Minecraft with the Magic Launcher.

I have both 32 and 64-bit java installed on my machine. I'll try the magic launcher and see if that helps.

Edit: Magic Launcher doesn't seem to have helped at all.

Did u tried Optifine?

Quote from Tedster

I'd suggest you uninstall your 32-bit version of Java then.

Quote from Hidinginthelight

I'd actually recommend removing both Java versions and then reinstalling only the 64 bit version.
Lag that starts after awhile suggests a java memory leak, and that sounds like a bad install to me. Removing java, put back only the version you need.

Neither of these worked.

If it's the same problem that I had, then if you look at Task Manager you will notice java taking up most of your computer's RAM when you see Minecraft's performance drop to zero. I have 6 gigs of RAM and Minecraft would run for about 10-15 minutes and then drag down to a few frames per second. I created a startup batch file to get rid of this problem.

Anyway, I created a folder called 'D:\Minecraft' and downloaded 'minecraft.jar' from the site https://minecraft.net/download
I installed 64-bit Java into the folder 'D:\jre7u9'
I then created a file with Notepad called 'mineopto.bat' and saved it in 'D:\Minecraft' The file 'mineopto.bat' contains the below text:

d:\jre7u9\bin\javaw -server -Xms512m -Xmx1536m -XX:SurvivorRatio=16 -XX:PermSize=128m -Xmn256m -Xnoclassgc -jar minecraft.jar

'd:\jre7u9\bin\javaw' is 64-bit runtime Java.
'minecraft.jar' is the minecraft jar startup file I downloaded from https://minecraft.net/download
'minecraft.jar' is located in the same folder as my startup batch file.

After I started using that batch file, I could run Minecraft all evening with no slowdowns.

That's about it... Hope that gets you up and running!

Quote from PuppetPal Clem

If it's the same problem that I had, then if you look at Task Manager you will notice java taking up most of your computer's RAM when you see Minecraft's performance drop to zero. I have 6 gigs of RAM and Minecraft would run for about 10-15 minutes and then drag down to a few frames per second. I created a startup batch file to get rid of this problem.

Anyway, I created a folder called 'D:\Minecraft' and downloaded 'minecraft.jar' from the site https://minecraft.net/download
I installed 64-bit Java into the folder 'D:\jre7u9'
I then created a file with Notepad called 'mineopto.bat' and saved it in 'D:\Minecraft' The file 'mineopto.bat' contains the below text:

d:\jre7u9\bin\javaw -server -Xms512m -Xmx1536m -XX:SurvivorRatio=16 -XX:PermSize=128m -Xmn256m -Xnoclassgc -jar minecraft.jar

'd:\jre7u9\bin\javaw' is 64-bit runtime Java.
'minecraft.jar' is the minecraft jar startup file I downloaded from https://minecraft.net/download
'minecraft.jar' is located in the same folder as my startup batch file.

After I started using that batch file, I could run Minecraft all evening with no slowdowns.

That's about it... Hope that gets you up and running!

When I try running the batch file, I just get an error message saying "A Java Exception has occurred."

Edit: Never mind. I had downloaded the minecraft executable, not jar file. My bad. Seems to be working fine, will edit again if things change.

Edit 2: Nope, same issue happened again. It ran smoothly for about 5 minutes before decided to drop to an unplayable frame rate.