diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index 5a6e2868..3eb7d8aa 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -5696,6 +5696,20 @@ public sealed class GameWindow : IDisposable
                     // lift shifted horizontal portal planes 2 cm, side-culling deck/stair cells).
                     BuildLoadedCell(envCellId, envCell, cellStruct, physicsCellOrigin, physicsCellTransform);
 
+                    // PHYSICS cell graph: cache EVERY cell with a valid cellStruct, regardless of
+                    // drawable sub-meshes. The camera-collision sweep (SmartBox::update_viewer →
+                    // sphere_path.curr_cell, pc:92870) and the player cell-transit must be able to
+                    // TRANSIT THROUGH a portals-only connector — otherwise the viewer/curr cell can
+                    // never reach it and lags one cell behind the eye (#133 residual: the camera sat
+                    // 1.32 m past the ramp portal's plane while the viewer cell stalled in
+                    // 0x00070103 — the sweep transited every cached neighbour but NEVER the
+                    // un-cached connector 0x014D — so the side test culled the on-screen connector
+                    // portal and the grey clear showed through). Retail keeps the whole landblock
+                    // cell array resident for the sweep; a portals-only connector has an empty
+                    // collision BSP but its portals drive the transit. CacheCellStruct reads the
+                    // cellStruct directly, not the render sub-meshes.
+                    _physicsDataCache.CacheCellStruct(envCellId, envCell, cellStruct, physicsCellTransform);
+
                     var cellSubMeshes = AcDream.Core.Meshing.CellMesh.Build(envCell, cellStruct, _dats);
                     if (cellSubMeshes.Count > 0)
                     {
@@ -5713,10 +5727,6 @@ public sealed class GameWindow : IDisposable
                             cellWorldPosition: cellOrigin,
                             cellRotation:      envCell.Position.Orientation,
                             staticObjects:     System.Array.Empty<(uint, System.Numerics.Vector3, System.Numerics.Quaternion, bool, System.Numerics.Matrix4x4)>());
-
-                        // Cache CellStruct physics BSP for indoor collision (UNCHANGED — gated
-                        // on drawable cells; a portals-only connector has no collision surface).
-                        _physicsDataCache.CacheCellStruct(envCellId, envCell, cellStruct, physicsCellTransform);
                     }
                 }
             }