When working with huge amounts of data on DataGroup, SkinnableDataContainer and all its Subclasses you will notice degradation in performance. Manipulating Data becomes slower, the UI on the Groups become less responsive, startup suffers, footprint is huge.  By default, Felx 4 creates an ItemRenderer for each data-item resulting in this overhead. (more…)

Here are some notes I took while investigating and reading about Spark Containers. (more…)