> This is also my main pet peeve on the web. You can't measure a precise frame duration (made much worse by Spectre/Meltdown mitigations), but you also can't query the display refresh rate.

Vulkan has extensions for measuring frame timings. I suspect DirectX 12 does too, given how similar it is to Vulkan.

See: https://www.khronos.org/registry/vulkan/specs/1.2-extensions...