VSR: check_routability command in TCL script runs for more than one day on a small design

Hi, 

I am running a TCL script from the CIW window to invoke some VSR router commands like check_routability and check_connectivity. 

I have a small layout design with less than 10 pcell instances and the check_routability command is taking more than a day to finish. I am using version IC23.1. 

When I invoke routability command from the GUI window in virtuoso (verify -> design -> routability), it finishes within an hour. Is there any difference as to why the runtime is so drastically different? Another odd behavior is that the GUI approach does not check all the pins correctly and misses some pins wheras the TCL script once finished actually does mark all the pins.

I am only running it on two nets as well and not the entire design. Do you guys have any suggestions to decrease the runtime as I would like to use the TCL script approach. 

Here is the command I give in the TCL script:

check_routability -net {net1 net2}

If you could help explain what needs to be enabled in the GUI to match the settings in the TCL command that would be great as well!

Thanks!