We recently updated to Cesium b21 and found that some fairly large (5+ MB) CZML data files are now locking up Firefox (v.17) for a significant period of time as the CZML is parsed and processed.
One of the larger CZML file contains many, many polylines to outline U.S. state borders. There is no time information associated with this data.
Has anyone else noticed this kind of performance issue when loading large CZML files?
Would the Cesium team recommend against loading this kind of data via CZML? And, if so, would you suggest either an image overlay or some other geo format like GeoJSON to present this sort of reference data?
Thanks for any insight you might have.