Hi junkw,
Thanks for those additional details! It sounds like you’re working with a fairly widget-heavy project. In this case, you may be able to improve the overall save time by reducing the total number of widgets and/or interactions on your project pages. We generally recommend shooting for a total widget count of 500 or fewer, with 40 or fewer dynamic panels (and 100 or fewer total panel states) per page. Since it sounds like you’re using a large number of master widgets, you’ll also want to be particularly mindful of the more complex widgets such as tables, repeaters, or dynamic panels that may be contained within these masters.
While every project is different, your prototype will be much more likely to perform better below these numbers. If you’re interested, you can find some more technical information from one of our devs regarding prototype performance here: