I have an app which is taking a enormously long time to save. The app's script simply contains a binary statement to load the data. The GUI contained within the app is 95% hidden during save so charts, etc. should be inactive. There are maybe 3 text objects on the "splash" screen displayed during the save with no calculations. I've disabled compression - yet the save process can take up to 5 or more minutes to complete.
My next suggestion would be to start deleting UI objects -- perhaps a sheet at a time -- to try and isolate where the problem is. That doesn't solve your problem, but if you can identify a "bad guy" maybe a fix or workaround can be created.
