O.K., these organizational/structural concerns are fine, but are not what my point is addressing, which was OPs motivation of React on performance grounds. Yes

O.K., these organizational/structural concerns are fine, but are not what my point is addressing, which was OPs motivation of React on performance grounds. Yes, grids seem to always be a problem. This is one of those 'sticky wickets' (for frameworks too!). Of course it can be solved, but i'm more interested in the general case here.