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If you load larger ontologies, we recommend use of the command line options, this will allow manipulation of the memory allocated for loads of larger terminologies such as SNOMED. Scripting options can be added to the scripts contained at <LexEVS install base>/gui.  If a user is working on a Linux environment with a 64 bit architecture, then they can use the Linux_64-lbGUI.sh file.  On a server class computer with say 16  gigabytes of memory and 8 four core processors users can access fairly substantial resources to load content.   Open the .sh file with a text editor and edit the values for -Xmx and -XX:MaxPermSize as follows "-Xmx6000M -XX:MaxPermSize=256M"  or more if you have resources available. At this setting it could still take about 33 hours to load a terminology as large as SNOMED.