Comment 1 for bug 787260

Hopefully 0.49 will have these issues resolved for you. Last summer a student replaced our older renderer with one that has much better performance. Additionally, this summer he is planning on working on additional enhancements such as rendering the on-canvas controls to a different layer. This way things like the node selection should not get bogged down. Unfortunately we don't have a timeframe for 0.49 at the moment, but I'm hopeful it will be 4th quarter of this year (again, not official, just my hopes).