Too many widgets - it is a very heavy project. For prototyping, you do not need to show everything completely in working order. For example, programmers need only one point, and all the others need to be done fake. And never make similar projects using a fluid width and breakpoints. This adds even more heaviness and glitches. Only use fixed width layout. If you want to show how a responsive layout should work, create each separate page in the new project, after you finish the basic prototyping.
Pavel Homeriki Thank you.
I first time use Muse for prototyping. You advice is very helpful, i take it in my further projects. But right now i have task to export this project. Muse is commercial tool and i was using only it official abilitys, it have to work. Or instead it have to inform me about limitations. Without stucking.
I do not think that you can do anything except copy everything into a new project, observing the rules about which I wrote.