Enabling curvature graph on ALL edges of a SubD is not ok.
With big SubDs, it kills performance and clogs the viewport with countless graphs/hairs.
Using History=on, extracting some edge, and doing curvature graph on those edges only, is faster (performance-wise) and way more useful (and analyzing only what the user want, not everything)
Please consider making it possible to select SubD edges for curvature analysis.
PS Even curvature analysis would be super if applied only on some SubD faces, faster computation, hopefully.