Performance.

libs/kimath/src/geometry/seg.cpp

@@ -374,7 +374,12 @@ const VECTOR2I SEG::NearestPoint( const VECTOR2I& aP ) const
     if( l_squared == 0 )
         return A;
 
-    ecoord t = d.Dot( aP - A );
+    // Inlined for performance reasons
+    VECTOR2L pa;
+    pa.x = static_cast<int64_t>( aP.x ) - A.x;
+    pa.y = static_cast<int64_t>( aP.y ) - A.y;
+
+    ecoord t = d.Dot( pa );
 
     if( t < 0 )
         return A;

libs/kimath/src/geometry/shape_line_chain.cpp

@@ -1258,13 +1258,8 @@ int SHAPE_LINE_CHAIN::ShapeCount() const
 
 SEG SHAPE_LINE_CHAIN::Segment( int aIndex ) const
 {
-    int segCount = SegmentCount();
-
     if( aIndex < 0 )
-        aIndex += segCount;
-
-    wxCHECK( aIndex < segCount && aIndex >= 0,
-             m_points.size() > 0 ? SEG( m_points.back(), m_points.back() ) : SEG( 0, 0, 0, 0 ) );
+        aIndex += SegmentCount();
 
     if( aIndex == (int) ( m_points.size() - 1 ) && m_closed )
         return SEG( m_points[aIndex], m_points[0], aIndex );