The Table component does send the visible buffer to the client on every update.
This is clearly suboptimal in many situations after the initial rendering and is one of the many things we would like to address in an extensive rework of the Table component, but at the moment there is no timetable on when that would be available.
This is definitely something that is desired (partial update/refresh) on larger tables/container implementations. Been waiting for the server push and the table rewrite for exactly this reason!!