Refine GUI performance when updating the graph

[lukehsiao]

To Do:

• Get rid of the numbers on the labels (we just want to show a shape).
• Fix our formulas so that it is more accurate to what cubic actually does, if possible.
• Reduce the updates on the graph so that even low powered machines can slide beta and see the adjustments without lagging.

[lukehsiao]

First two points are fixed in ea7c810, but graph still feels laggy when we drag beta or alpha quickly.