How to visualize UI hanging using Concurrency Visualizer in VS 2013

Fx 4.5 Aysnc-Wait allow UI Processing 80%+ of time, while Fx 4.0 Blocking Collection only allow 20%-





Ring Buffer looks better in UI Processing more like 40%



(a comparison of different logging code writing log intensively on a WPF Form, seems like comparing in memory buffer vs. async-await thread suspension)