You will run into both memory issues as well as issues with our rendering engine if you were to try to create 60k objects in an OptiFDTD. the product can be run in “batch mode” from the command line where you can setup scripts to create the geometry, run, and analyze the results and therefore bypassing the GUI. You may still run into memory issues with that many components but that is the route I would suggest.
Instructions for running in batch mode can be found in the user reference in the help menu.
We are working on a component which can handle this kind of structure but it will be some time before that makes it to a releease.
Scott