Sleep time
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
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These segments in the timeline are associated with the blocking time that is categorized as Sleep. The sleep category implies that a thread has voluntarily given up its logical core and is doing no work. During this time, a thread has been blocked in an API that the Concurrency Visualizer is counting as Sleep. APIs such as Sleep() and SwitchToThread() fall into this group.