diff --git a/include/geometry/shape_line_chain.h b/include/geometry/shape_line_chain.h
index 98584a0dc4..250e0e797b 100644
--- a/include/geometry/shape_line_chain.h
+++ b/include/geometry/shape_line_chain.h
@@ -84,18 +84,6 @@ public:
         SHAPE( SH_LINE_CHAIN ), m_points( aShape.m_points ), m_closed( aShape.m_closed )
     {}
 
-    SHAPE_LINE_CHAIN& operator=( const SHAPE_LINE_CHAIN& aShape )
-    {
-        if( this == &aShape )
-            return *this;
-
-        m_type = SH_LINE_CHAIN;
-        m_points = aShape.m_points;
-        m_closed = aShape.m_closed;
-
-        return *this;
-    }
-
     /**
      * Constructor
      * Initializes a 2-point line chain (a single segment)
@@ -388,8 +376,14 @@ public:
      */
     void Append( const VECTOR2I& aP, bool aAllowDuplication = false )
     {
+        if( m_points.size() == 0 )
+            m_bbox = BOX2I( aP, VECTOR2I( 0, 0 ) );
+
         if( m_points.size() == 0 || aAllowDuplication || CPoint( -1 ) != aP )
+        {
             m_points.push_back( aP );
+            m_bbox.Merge( aP );
+        }
     }
 
     /**
@@ -407,12 +401,14 @@ public:
         {
             const VECTOR2I p = aOtherLine.CPoint( 0 );
             m_points.push_back( p );
+            m_bbox.Merge( p );
         }
 
         for( int i = 1; i < aOtherLine.PointCount(); i++ )
         {
             const VECTOR2I p = aOtherLine.CPoint( i );
             m_points.push_back( p );
+            m_bbox.Merge( p );
         }
     }
 
@@ -677,6 +673,9 @@ private:
 
     /// is the line chain closed?
     bool m_closed;
+
+    /// cached bounding box
+    BOX2I m_bbox;
 };
 
 #endif // __SHAPE_LINE_CHAIN
diff --git a/include/geometry/shape_segment.h b/include/geometry/shape_segment.h
index c62d4d1fae..50fa87cdc8 100644
--- a/include/geometry/shape_segment.h
+++ b/include/geometry/shape_segment.h
@@ -40,18 +40,6 @@ public:
     SHAPE_SEGMENT( const SEG& aSeg, int aWidth = 0 ):
         SHAPE( SH_SEGMENT ), m_seg( aSeg ), m_width( aWidth ) {};
 
-    SHAPE_SEGMENT& operator=( const SHAPE_SEGMENT& aOther )
-    {
-        if( this == &aOther )
-            return *this;
-
-        SHAPE::operator=( aOther );
-        m_seg = aOther.m_seg;
-        m_width = aOther.m_width;
-
-        return *this;
-    }
-
     ~SHAPE_SEGMENT() {};
 
     SHAPE* Clone() const override
diff --git a/pcbnew/router/pns_item.h b/pcbnew/router/pns_item.h
index f34353a1d4..a2d4975a6e 100644
--- a/pcbnew/router/pns_item.h
+++ b/pcbnew/router/pns_item.h
@@ -92,24 +92,6 @@ public:
         m_routable = aOther.m_routable;
     }
 
-    ITEM& operator=( const ITEM& aOther )
-    {
-        if( this == &aOther )
-            return *this;
-
-        m_layers = aOther.m_layers;
-        m_net = aOther.m_net;
-        m_movable = aOther.m_movable;
-        m_kind = aOther.m_kind;
-        m_parent = aOther.m_parent;
-        m_owner = NULL;
-        m_marker = aOther.m_marker;
-        m_rank = aOther.m_rank;
-        m_routable = aOther.m_routable;
-
-        return *this;
-    }
-
     virtual ~ITEM();
 
     /**
diff --git a/pcbnew/router/pns_joint.h b/pcbnew/router/pns_joint.h
index 419d089caf..2e68b43779 100644
--- a/pcbnew/router/pns_joint.h
+++ b/pcbnew/router/pns_joint.h
@@ -82,26 +82,14 @@ public:
     JOINT( const JOINT& aB ) :
         ITEM( JOINT_T )
     {
+        m_layers = aB.m_layers;
         m_tag.pos = aB.m_tag.pos;
         m_tag.net = aB.m_tag.net;
         m_linkedItems = aB.m_linkedItems;
+        m_layers = aB.m_layers;
         m_locked = aB.m_locked;
     }
 
-    JOINT& operator=( const JOINT& aOther )
-    {
-        if( this == &aOther )
-            return *this;
-
-        ITEM::operator =( aOther );
-        m_tag.pos = aOther.m_tag.pos;
-        m_tag.net = aOther.m_tag.net;
-        m_linkedItems = aOther.m_linkedItems;
-        m_locked = aOther.m_locked;
-
-        return *this;
-    }
-
     ITEM* Clone( ) const override
     {
         assert( false );
diff --git a/pcbnew/router/pns_line.cpp b/pcbnew/router/pns_line.cpp
index 74ab1189a3..bd83594250 100644
--- a/pcbnew/router/pns_line.cpp
+++ b/pcbnew/router/pns_line.cpp
@@ -57,15 +57,16 @@ LINE::~LINE()
 
 LINE& LINE::operator=( const LINE& aOther )
 {
-    if( this == &aOther )
-        return *this;
-
-    ITEM::operator =( aOther );
-
     m_line = aOther.m_line;
     m_width = aOther.m_width;
+    m_net = aOther.m_net;
+    m_movable = aOther.m_movable;
+    m_layers = aOther.m_layers;
     m_via = aOther.m_via;
     m_hasVia = aOther.m_hasVia;
+    m_marker = aOther.m_marker;
+    m_rank = aOther.m_rank;
+
     copyLinks( &aOther );
 
     return *this;
diff --git a/pcbnew/router/pns_segment.h b/pcbnew/router/pns_segment.h
index 1d2424bff7..d07229c8f5 100644
--- a/pcbnew/router/pns_segment.h
+++ b/pcbnew/router/pns_segment.h
@@ -58,16 +58,6 @@ public:
         m_rank = aParentLine.Rank();
     }
 
-    SEGMENT& operator=( const SEGMENT& aOther )
-    {
-        if( this == &aOther )
-            return *this;
-
-        ITEM::operator =( aOther );
-        m_seg = aOther.m_seg;
-        return *this;
-    }
-
     static inline bool ClassOf( const ITEM* aItem )
     {
         return aItem && SEGMENT_T == aItem->Kind();
diff --git a/pcbnew/router/pns_solid.h b/pcbnew/router/pns_solid.h
index fecb8ca1d4..a4d4a7d848 100644
--- a/pcbnew/router/pns_solid.h
+++ b/pcbnew/router/pns_solid.h
@@ -52,18 +52,6 @@ public:
         m_pos = aSolid.m_pos;
     }
 
-    SOLID& operator=( const SOLID& aOther )
-    {
-        if( this == &aOther )
-            return *this;
-
-        ITEM::operator =( aOther );
-        m_shape = aOther.m_shape->Clone();
-        m_pos = aOther.m_pos;
-
-        return *this;
-    }
-
     static inline bool ClassOf( const ITEM* aItem )
     {
         return aItem && SOLID_T == aItem->Kind();
diff --git a/pcbnew/router/pns_via.h b/pcbnew/router/pns_via.h
index 9b9df762d2..8bb002837a 100644
--- a/pcbnew/router/pns_via.h
+++ b/pcbnew/router/pns_via.h
@@ -79,21 +79,6 @@ public:
         m_viaType = aB.m_viaType;
     }
 
-    VIA& operator=( const VIA& aOther )
-    {
-        if( this == &aOther )
-            return *this;
-
-        ITEM::operator =( aOther );
-        m_pos = aOther.m_pos;
-        m_diameter = aOther.m_diameter;
-        m_shape = SHAPE_CIRCLE( m_pos, m_diameter / 2 );
-        m_drill = aOther.m_drill;
-        m_viaType = aOther.m_viaType;
-
-        return *this;
-    }
-
     static inline bool ClassOf( const ITEM* aItem )
     {
         return aItem && VIA_T == aItem->Kind();