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In SemaphoreSlim.Wait (https://github.com/mono/mono/blob/master/mcs/class/corlib/System.Threading/SemaphoreSlim.cs#L175)
When millisecondsTimeout is at the default -1 value (when no timeout), the handle.WaitOne waits 1msec where it should wait deepSleepTime (20msec). This causes a lot of CPU waste when the semaphore is waiting.
A simple fix is to wait deepSleepTime (20msec) which is the maximum time currently allowed by this semaphore.
More work could be done to improve this logic and optimize this.
This was merged.