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).
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).