LoadUI 2.1.2 max heap size setting

Hi,

Any idea what the max heap size we could use for LoadUI 2.1.2 Pro? I couldn't start the app if the -mx is larger than 1500m. Any idea? I thought the 32bit JVM should support up to 4G VM. Is the embedded javaws has any limitation? Would the Linux one do any better?

Thanks,
John