Flow's drawing engine was rebuilt from the ground up in version 4.5. Pages load near-instantly, panning is smooth, and you can zoom in 10× further than before. This post is a good part of why we did it.

If Flow felt sluggish when you last used it, it's worth another look. And if anything still drags on your device, email flow@bonobolabs.com with your iPad model - that detail helps.