FEMAP holds parts of your model and results in memory. To reduce the amount of memory FEMAP uses to do this, choose File > Preferences and click the Database tab. In the Database Performance group, reduce the Database Memory Limit by dragging the slider to the left. This decreases the amount of memory FEMAP uses for holding parts of your model and causes FEMAP to rely more on swapping to the scratch file. Note that this does not control the total amount of memory FEMAP uses, which includes commands, holding data in the data table, and drawing your model.