Feedback on frame graphs

I did a perf test with stress scene in Seedborn against frame graph in webgl2. The frame graph should be a 1 for 1 match against scene.render(), with the exception that the FrameGraphCascadedShadowGeneratorTask is using shadowMaxZ instead of autoCalcDepthBounds.

a) No visible change or improvement, similar result as past.
b) Hovering aroung 40fps.
c) Definite improvement in the latest ffox release.
d) Hovering aroung 30fps

It seems my frame graph is not as performant as I thought it was. Nothing jumps out at me from the profiler. Is there a way to perf chk each pass in the frame graph? Or did I miss some optimization flags?