After updating to 1903 LatencyMon associates ntoskrnl.exe with large latency spikes on the order of ~1,300µs. Same results with KB4497935.
I posted here too as I thought it could be related to the GPU driver:
Others are also reporting similar symptoms. E.g. in some instances this results in noticeable audio clicks/pops.
Are you seeing similar results?
Does anyone at Microsoft acknowledge this?
It should be easily reproducible.
KB4505903 seems to have significantly mitigated the ntoskrnl.exe latency spikes for many users.