V2: Perform a performance sweep and code review

[Rycochet]

Between getting to beta and marking for a full release, we need to go through and check various specific things to improve performance and reduce memory footprint. Most of these things will require some form of profiling and / or jsperf style tests for speed.

Don't Prematurely Optimise!

• Temporary Arrays and Objects waste memory.
• Reducing the size of needed Objects where possible.
• Loop unrolling.
• Caching unused Objects while animations are running and they can be re-used / saved from the GC.
• Public API is not exposing private data, and is exposing useful methods.
• Public API comments are well formatted for the developer docs.
• All options and functions have tests that work properly.

...this list is subject to grow and change as ideas occur.

[Rycochet]

Closing due to #927