You might find the TC1 runs very slowly. It is because it has several nested loops which emits very verbose Step Execution logs. It requires long seconds to flush the bulky messages into the Log Viewer GUI.
If you are an KS Enterprise user, you can toggle the Step Executio logging Off in the Project Settings > Execution dialog.
Even if you do not have the Enterprise license, still you have an option to make it quicker. See
let me remind you of this issue. I hope the option of toggling Step Execution Log to be available to all KS free version users. @Bailrod wrote to me:
This post might help, because i have a similar performance issue with a json array loop, converted into excel file and logging sooooooo much info that takes a lot of time !