This example demonstrates the effect of DisplayObject.cache() and snapToPixel
on performance. Caching can provide performance benefits for some types of content because the complex vector
shapes do not have to be re-rendered each tick. Different browsers have different thresholds for when
caching makes sense. The results for snapToPixel vary between browsers, but in general it will have no
effect on the un-cached shapes, but a significant effect when cached.
Note that Safari 6+ performs worse in this demo with caching due to how it
handles vectors very well, and small textures very poorly.