Hi @skippu Skip,
The Tiller team has not published anything about the Check Performance command to my knowledge.
I did a post about using the Check Performance command and you can read about my results here:
How to reduce time to open a workbook, improve performance and reduce workbook size
There is another post by @bdunks about how to reduce the file size using a different process found here:
How to Reduce File Size by 6MB in the Tiller Foundation Template
Check the posts out and let me know if you have any questions.
Clint