Performance issue for different camera views

[hpinkos]

Reported on the forum: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/D_ma3ioftI8

User reports that performance is worse for a top down view than a 45 degree angle camera view. See the forum post for a code sample

[lilleyse]

I wonder if it's related to this: #4166 (comment), even though that is apparently fog related.

[theranch]

I notice performance hit when using flyTo. There seems to be a need for Cesium to use more system resources when I use flyTo.