@box said: The import dialog that opens in which you choose the file to import has a large button just next to the Import button that says Options. Thanks, I've never even noticed that before!

@box said: There can be various reasons for slow performance, from inefficient workflow to some flaw in the computer settings. Without seeing an example of your work we can only guess. A large file size doesn't always mean slow, I was working on a 415mb file only yesterday on a very low end laptop without any stutter. And I can create a 100kb file that will bring the best PC to it's knees. A model to look at would help us to understand if it is your workflow or your system that would benefit from some tweaking. Here's the model that I'm working on. Let me know if I can optimize it any more.