BenchmarkDotNet=v0.13.0, OS=Windows 10.0.18363.1316 (1909/November2019Update/19H2)
Intel Core i7-8550U CPU 1.80GHz (Kaby Lake R), 1 CPU, 8 logical and 4 physical cores
.NET SDK=5.0.300
  [Host]     : .NET 5.0.6 (5.0.621.22011), X64 RyuJIT
  DefaultJob : .NET 5.0.6 (5.0.621.22011), X64 RyuJIT
MethodMeanErrorStdDevRatioRatioSD
AwaitSeqDummyMonitorFake37.03 ms1.232 ms3.574 ms1.000.00
AwaitSeqSemaphoreSlimFake36.43 ms0.714 ms1.359 ms1.000.10
ParallelAwaitWhenAllFake14.87 ms0.297 ms0.669 ms0.410.04
AwaitSeqDummyMonitorReal38.73 ms0.972 ms2.819 ms1.060.12
AwaitSeqSemaphoreSlimReal36.94 ms0.731 ms1.459 ms1.010.09
ParallelAwaitWhenAllReal14.93 ms0.282 ms0.681 ms0.410.04
ParallelAwaitWhenAllJsonSeqReal15.97 ms0.319 ms0.835 ms0.440.04