[mwcampbell]

> To give round numbers, the roundtrip latency is on the order of 100µs

I can't help but notice that, at least in my experience on Windows, this is the same order of magnitude as for inter-process communication on the local machine. Tangent: That latency was my nemesis as a Windows screen reader developer; the platform accessibility APIs weren't well designed to take it into account. Windows 11 finally has a good solution for this problem (yes, I helped implement that while I was at Microsoft).