This article explains the limitations of the Time Stamp Counter register on multi-core x86 CPU's: Wiki Time Stamp Counter.
Evidently not applicable as Hi:Res does something different? See note from BrowserUk. I am unaware of any hardware source for a high resolution time other than this CPU feature. I'd be curious if somebody knows of some alternative. As article mentions, MS provides an API for times, but it uses this hardware.
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