I'll take your word for it, as I can't find the quote in context.
But I'm unfamiliar with any polling pattern where poll requests are expected to overlap. If updates take microseconds, does that mean I can comfortably run 10,000 of these in a second?
I even think datastar looks cool, but I just think that quote is misleading, and I still think that.
I'd like to see some realistic results, like the kind measured by this[1] type of benchmark. "Microsecond" updates sounds like microbenchmarks with very carefully crafted definitions.