ZPE performance improvements in the future

ZPE has continually improved to the point where LAME X2 has improved what I had always aimed to improve in the evaluator. As a result of this new improvement, I don't foresee any easy way to improve performance on the same level as I have recently. This has meant that over the last few years, performance improvements have always been minor (bar the latest update), and I foresee this being the future.

There are plans for more compiler optimisations, and many of the improvements focus on this and more efficient variable declaration and function calling. If you have any suggestions for improving the performance of ZPE, please let me know.