Users can define the DesktopHeap size, in KB, for E3 processes executing on the SYSTEM account in the Define DesktopHeap Size option. This value must be between 512 and 12288 KB for 32-bit systems and 768 and 20480 KB for 64-bit systems. Default value of this option is 4096 KB for 32-bit systems and 6144 KB for 64-bit systems.