I am completing the first revision of a Add-In that I have been developing for a few months. The biggest problem I have encountered is that everything is synchronous and single threaded. Depending on the system, network, and cloud performance this produces results from acceptable to angry-uninstall. I did try using setTimeout but I cannot affect UI elements from those functions without locking up the whole UI. There are a number of small changes that would allow greater user interaction while doing compute bound or IO bound operations. I would be happy to discuss all of those if there is interest.
Thank you,
Aron
