Each time a Phantom launches, it needs to load the input spreadsheet.
Some input files are a few hundred lines, but others are way bigger. It takes about 1 second to load 1000 lines. So, if your file is under 10k or 20k lines, that's fine. However, some of our users are loading files with 2m+ lines at each launch. This means 30+ minutes of loading time per launch!
If you have this much data to process, we'd recommend dividing it up and using smaller input files to save your execution time - try dividing big files into sheets of 30k lines.
If you think this article does not address your issue, please contact Support directly. We are continuously improving, so your feedback means the world to us!