christopher hercules

No improvement in FPS? Is your proc maxing out at 100% when the JVM initializes?

Did you adjust the -Vmx1G JVM argument to a bigger number? Also, are you running 64 bit jre8u20?

I have tested on a 4 core build, an 8 core build, and a dual core build (all AMD). Same issue. Adjusting the JVM arguments resolved it, however.

I was having issues with this as well. The "Upgrade your hardware/lower your settings solution" is pretty worthless for the most part. This is the fix that worked for me:

1.) Download the 64 bit version of JRE8u20 from Oracle's website and install it: http://www.oracle.com/technetwork/java/javase/downloads/jre8-downloads-2133155.html

2.) Load the Minecraft launcher and select "Profile Editor." Select your profile and click edit profile.

3.) Check the box that says JVM Arguments. And change the value that says "-Xmx1G" to "-Xmx2G" or higher... This determines the maximum allocation of RAM for the JVM that runs Minecraft. If you'd like, you can even add the following argument to set a minimum value: "-Xms2G"

After performing these steps I saw immediate improvement in frame rate (10FPS to 150FPS) and drop in game lag. Hope this helps someone out there.