• Enable progressive decoding by default – it can now be done without sacrificing performance in any meaningful way. To disable it, set isProgressiveDecodingEnabled to false.
• Enable storing progressively decoding previews in the memory cache by default (isStoringPreviewsInMemoryCache)
• Add isAsynchronous property to ImageDecoding that allows slow decoders (such as custom WebP decoder) to be executed on a dedicated operation queue (the existing imageDecodingQueue), while allowing fast decoders to be executed synchronously
• Add entryCostLimit property to ImageCache that specifies the maximum cost of a cache entry in proportion to the costLimit. 0.1, by default.