We have a catalog of over 120000 items, and we have a custom inventory item field that is intended to hold a computed value based on some sublist values. This value is generated when the product is saved using a User Event script, but we need to generate this value for every product automatically. Our first attempt was by running a CSV import, but sublist values aren’t populated and the user event script is unable to generate the value. Our second attempt was using a map/reduce script, but this has been running in the sandbox for over a week and hasn’t completed. The script is working, I can see output in the Script Execution log, but the speed is atrocious. What is the recommended method for updating a large quantity of items?