Never more stretch than Smart UV Project, on any mesh: the built-in projection is now always measured and sets the stretch limit; the densest unwrap within it is kept (on two dense busts, 140k and 188k faces, stretch was 1.27x and 1.25x against 1.17x and 1.15x for the built-in; now equal, with 54.6% and 59.9% coverage against 53.4% and 48.7%).

Four times faster on very dense meshes: 188k faces in 113 s instead of 484 s (above 60k faces the add-on's own seams are unwrapped with Conformal; the second full unwrap is skipped when the built-in projection already passes).

Verified from the installed archive on Blender 4.2.9 and 5.2.2.