diff --git a/crates/kernel/src/body.rs b/crates/kernel/src/body.rs
index e2ac5f5c..2e07cd46 100644
--- a/crates/kernel/src/body.rs
+++ b/crates/kernel/src/body.rs
@@ -1326,6 +1326,10 @@ impl Body {
     /// The reference mesher's angular display mesh: what [`Body::display_mesh_angular`] falls
     /// back to when no plan can be made.
     pub fn reference_display_mesh_angular(&self, tol: f64, angle: f64) -> Result<Mesh> {
+        crate::profile::timed(crate::profile::Kind::Tessellate, || self.reference_display_mesh_angular_untimed(tol, angle))
+    }
+
+    fn reference_display_mesh_angular_untimed(&self, tol: f64, angle: f64) -> Result<Mesh> {
         if let Some((shared, t)) = self.display_of.as_deref()
             && let Some(placed) =
                 shared.mesh.get_or_init(|| shared.original.reference_display_mesh_angular(tol, angle).ok()).as_ref().and_then(|m| placed_mesh(m, t))
diff --git a/crates/kernel/src/polybool.rs b/crates/kernel/src/polybool.rs
index 951c3216..665765c1 100644
--- a/crates/kernel/src/polybool.rs
+++ b/crates/kernel/src/polybool.rs
@@ -343,6 +343,10 @@ fn faceted_polys(b: &Body, tol: f64, operand: usize) -> Option<Vec<Poly>> {
 /// triangles of `b`; an edge between facets of one face of `a`, or between triangles of `b`,
 /// has no origin.
 pub fn faceted_boolean(a: &Body, b: &Mesh, op: BoolOp, tol: f64) -> Result<Option<Body>> {
+    crate::profile::timed(crate::profile::Kind::Boolean, || faceted_boolean_untimed(a, b, op, tol))
+}
+
+fn faceted_boolean_untimed(a: &Body, b: &Mesh, op: BoolOp, tol: f64) -> Result<Option<Body>> {
     a.require_brep("a boolean")?;
     if !(tol.is_finite() && tol > 0.0) {
         return Err(KernelError::Invalid("facet tolerance".into()));
diff --git a/crates/kernel/src/profile.rs b/crates/kernel/src/profile.rs
index 56dfbcf4..5d1cea89 100644
--- a/crates/kernel/src/profile.rs
+++ b/crates/kernel/src/profile.rs
@@ -133,4 +133,18 @@ mod tests {
         let st = STATE.with(Cell::get);
         assert!(!st.on && !st.busy);
     }
+    #[test]
+    fn a_faceted_boolean_is_boolean_time_and_a_reference_mesh_tessellation() {
+        use crate::{BoolOp, box_solid, faceted_boolean};
+        use solidcraft_geom::Vec3;
+        let a = box_solid(Vec3::ZERO, Vec3::new(10.0, 10.0, 10.0)).unwrap();
+        let tool = box_solid(Vec3::new(5.0, 5.0, 5.0), Vec3::new(15.0, 15.0, 15.0)).unwrap().tessellate(0.1).unwrap();
+        // The thread groove's route: the faceting it does first is the boolean's time too.
+        let (r, t) = capture(|| faceted_boolean(&a, &tool, BoolOp::Cut, 0.01));
+        assert!(r.unwrap().is_some());
+        assert!(t.boolean_ms > 0.0 && t.tessellate_ms == 0.0, "{t:?}");
+        let (m, t) = capture(|| a.reference_display_mesh_angular(0.01, crate::DISPLAY_ANGLE));
+        assert!(!m.unwrap().triangles.is_empty());
+        assert!(t.tessellate_ms > 0.0 && t.boolean_ms == 0.0, "{t:?}");
+    }
 }