Improve speed for large masks

[paulmueller]

When masks are of great detail it becomes a bit of a hassle to manipulate their position and orientation. Often times only the knobs function and make it quite slow. Is there any way to make that more smooth/speed it up?

[paulmueller]

@StephanieMoe This is fixed in 0.4.3, albeit there is no macOS installer anymore, so you have to install via pip install --upgrade impose.

[StephanieMoe]

Great. Thanks. I will have a look. The new installation should be no problem.