Data-Driven Styling Slow Compared to Filters

[jasonpepper]

Using data driven styling to color vector-tile points where the point id is the category on which the points are colored is far slower when compared to using filters to achieve the coloring.

https://jsbin.com/xebisuk/edit?js,output

using MapBox GL v0.28.0

[mourner]

Currently stops-based function evaluation time grows linearly with the number of stops. Tracking possible performance improvement over mapbox/mapbox-gl-function#31