changes

fusion_plating/fusion_plating_shopfloor/controllers/shopfloor_controller.py

@@ -1206,6 +1206,28 @@ class FpShopfloorController(http.Controller):
                 c.get('date_deadline_iso') or FAR_FUTURE,
                 c.get('id') or 0,
             ))
+            # Cap urgency_pulse to top 3 critical cards per column
+            # (v19.0.24.10.0). With 267+ overdue cards across the board,
+            # 267 simultaneous infinite CSS keyframe animations were
+            # hammering the compositor and causing drag-drop stutter.
+            # Top 3 per column = ~30 active animations max, plenty
+            # visible, and the static red border on the card still
+            # signals "this one needs attention" for the rest.
+            critical_kept = 0
+            for c in cards:
+                if c.get('urgency_pulse'):
+                    if critical_kept < 3:
+                        critical_kept += 1
+                    else:
+                        c['urgency_pulse'] = False
+                # Flag every critical card so the template can apply a
+                # plain class instead of relying on the `:has()` CSS
+                # selector — `:has()` re-evaluates on every layout pass
+                # and was the real reason 5–6 second freezes happened
+                # during drag-drop on a busy board (v19.0.24.11.0).
+                c['is_urgent'] = c.get('urgency_band') in (
+                    'hot', 'overdue', 'bake_risk',
+                )
 
         # ---- Column order = recipe flow (v19.0.24.8.0) -------------------
         # Old code ordered work centres by their `sequence, code, name`