Freeze Artboards

I was reading a topic in the Issues thread and there seems to be a few users having issues dealing with very large Sketch files.

Would it be possible to freeze an Artboard? The way I think it should work is like this. When an Artboard is frozen then all of the layers are flattened and all of the Artboard information gets saved into a separate file so it can be unfrozen later. It’s a bit like freezing an audio track in a DAW.

Would this help with making Sketch more responsive when dealing with very large files?