Perf Testing Compared to Default D3 Interpolation

[emeeks]

I think it would be helpful if the documentation gave folks some sense of the performance of the interpolations with the segment options so they could plan accordingly. Right now I feel like I'm evaluating on a case-by-case basis which probably doesn't make sense for everyone.

[veltman]

Some benchmarks would be great. It'll be a little hard to avoid the case-by-case experimentation right now because the impact of maxSegmentLength depends on the particulars of the geometry and the coordinate space. But in v1 I'll probably turn this option into a relative value (e.g. maxSegmentLength: 0.1 = no segment can be longer than 10% of the total perimeter), which would reduce the guesswork.

Also need to investigate whether reducing the precision of coordinates in the generated path strings affects performance at all.