Hi Tim,

I see in your other post you are trying to use Substructuring so that might work.

In general, you can idealize the model and be very efficient with the use of nodes in the mesh. For example, replace thin solid sections with sheet bodies to use shell elements instead of solid elements.  Replace long thin sections of the model with beam elements instead of solid elements. Slice the geometry to use half the number of solid elements by meshing with hex elements instead of tet elements. Use symmetry if applicable.

If you want to upload a Workbench Project Archive of your model, I can make specific suggestions.