Is the laptop using the HPET for the QPC timer? (10MHz..) and the added latency[0] of calling into that is messing up the reported timings in the profiler?<p>[0]<a href="https://docs.microsoft.com/en-gb/windows/desktop/SysInfo/acquiring-high-resolution-time-stamps" rel="nofollow">https://docs.microsoft.com/en-gb/windows/desktop/SysInfo/acq...</a>
It would probably be a lot easier to deal with such problems if Windows was open source and you could just have a look what the system libraries are actually doing.