Why are load case combinations in POST1 so slow?
On large models, load case combination cannot be done in memory and
generate IO to file.page. Some ways to reduce this are the following:
1. After solution, return to ANSYS with a large -db workspace setting. This will
provide more space for the combinations to be done in memory.
2. Use INRES to limit the results being postprocessed.
3. Use SUBSET to reduce the model entities being postprocessed.