Hello, and how..?

So, I'm new here. Please help me.

Imagine I've got a sensor doing voltages into an ESP8266 gadget, behind an
Arduino. Seems to be the cheapest way, and then using web tech.

That thing now has a HTTP server. New to me the cards, but it worked so
good so easily, once I read other peoples blogs, howtos.
But I want as fast as possible, ok buffers, but fasty, records from sensors
to put on the web.
My feeling is that the device there should provide grand RDF stuff.
Squirt a load of data - but what is best for a stream in these
circumstances?
I really don't know:

<sample>
       godforsaken:value "10" .


I'm sure you are ahead, what is the current state of the art?

my notes - https://elfquake.wordpress.com/

Cheers,
Danny.