diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_alpha_shape_3.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_alpha_shape_3.cpp
index a4489287e56..b26c407bf48 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_alpha_shape_3.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_alpha_shape_3.cpp
@@ -29,6 +29,7 @@
 #include <CGAL/Alpha_shape_3.h>
 #include <CGAL/_test_cls_periodic_3_alpha_shape_3.h>
 
+#include <CGAL/Timer.h>
 
 // Inexact construction types
 typedef CGAL::Exact_predicates_inexact_constructions_kernel Gt;
@@ -65,8 +66,12 @@ typedef CGAL::Alpha_shape_3<EP3DT3>  EAlpha_shape_3;
 
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   _test_cls_alpha_shape_3<Alpha_shape_3>();
   _test_cls_alpha_shape_3_exact<EAlpha_shape_3>();
+
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }
 
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3.cpp
index 476d1c715e1..d07a0f964e5 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3.cpp
@@ -22,6 +22,8 @@
 #include <iostream>
 #include <fstream>
 
+#include <CGAL/Timer.h>
+
 #include <CGAL/Periodic_3_Delaunay_triangulation_3.h>
 #include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
 
@@ -47,6 +49,8 @@ template class CGAL::Periodic_3_Delaunay_triangulation_3<PTT3>;
 #include <CGAL/_test_cls_periodic_3_delaunay_3.h>
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   typedef CGAL::Periodic_3_Delaunay_triangulation_3< PTT1 > P3T3_1;
   _test_cls_periodic_3_delaunay_3( P3T3_1() );
 
@@ -57,5 +61,6 @@ int main()
   // this takes too much time for the test suite.
   //_test_cls_periodic_3_delaunay_3( P3T3_3(), true );
 
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3_bc.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3_bc.cpp
index afe0262d0f3..ce36a68a95e 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3_bc.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_3_bc.cpp
@@ -27,6 +27,8 @@ int main() { return 0;}
 #include <iostream>
 #include <fstream>
 
+#include <CGAL/Timer.h>
+
 #include <CGAL/Periodic_3_Delaunay_triangulation_3.h>
 #include <CGAL/Periodic_3_triangulation_traits_3.h>
 
@@ -52,6 +54,8 @@ template class CGAL::Periodic_3_triangulation_3<PTT3>;
 #include <CGAL/_test_cls_periodic_3_delaunay_3.h>
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   typedef CGAL::Periodic_3_Delaunay_triangulation_3< PTT1 > P3T3_1;
   _test_cls_periodic_3_delaunay_3( P3T3_1() );
 
@@ -62,6 +66,7 @@ int main()
   // this takes too much time for the test suite.
   //_test_cls_periodic_3_delaunay_3( P3T3_3(), true );
 
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }
 #endif
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_hierarchy_3.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_hierarchy_3.cpp
index b5d10421b6b..9cbf6d5bbc5 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_hierarchy_3.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_delaunay_hierarchy_3.cpp
@@ -22,6 +22,8 @@
 #include <iostream>
 #include <fstream>
 
+#include <CGAL/Timer.h>
+
 #include <CGAL/Periodic_3_Delaunay_triangulation_3.h>
 #include <CGAL/Periodic_3_triangulation_hierarchy_3.h>
 #include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
@@ -69,6 +71,8 @@ template class CGAL::Periodic_3_triangulation_hierarchy_3<PDT3>;
 #include <CGAL/_test_cls_periodic_3_delaunay_3.h>
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   typedef CGAL::Periodic_3_triangulation_hierarchy_3< PDT1 > P3T3_1;
   _test_cls_periodic_3_delaunay_3( P3T3_1() );
 
@@ -80,5 +84,6 @@ int main()
   // this takes too much time for the test suite.
   //_test_cls_periodic_3_delaunay_3( P3T3_3(), true );
 
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_offset_3.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_offset_3.cpp
index c0bd4aa61f3..740daa4cded 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_offset_3.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_offset_3.cpp
@@ -21,6 +21,7 @@
 #include <iostream>
 #include <fstream>
 
+#include <CGAL/Timer.h>
 #include <CGAL/Periodic_3_offset_3.h>
 
 typedef CGAL::Periodic_3_offset_3 Offset;
@@ -28,7 +29,10 @@ typedef CGAL::Periodic_3_offset_3 Offset;
 #include <CGAL/_test_cls_periodic_3_offset_3.h>
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   _test_cls_periodic_3_offset_3( Offset() );
 
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3.cpp
index a2d9119357b..0823c2d818a 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3.cpp
@@ -22,6 +22,8 @@
 #include <iostream>
 #include <cassert>
 
+#include <CGAL/Timer.h>
+
 #include <CGAL/Periodic_3_Delaunay_triangulation_3.h>
 #include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
 #include <CGAL/Periodic_3_triangulation_3.h>
@@ -55,6 +57,8 @@ template class CGAL::Periodic_3_triangulation_3<PDTT3>;
 
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   typedef CGAL::Periodic_3_triangulation_3<PDTT1>            P3T3_1;
   _test_periodic_3_triangulation_3_constructors( P3T3_1() );
   typedef CGAL::Periodic_3_Delaunay_triangulation_3<PDTT1>   P3DT3_1;
@@ -70,5 +74,6 @@ int main()
 //   typedef CGAL::Periodic_3_Delaunay_triangulation_3<PDTT3>   P3DT3_3;
 //  _test_cls_periodic_3_triangulation_3( P3DT3_3(), false, true );
 
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3_bc.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3_bc.cpp
index 1e14b103aba..33a03bb4851 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3_bc.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_3_bc.cpp
@@ -27,6 +27,8 @@ int main() { return 0;}
 #include <iostream>
 #include <cassert>
 
+#include <CGAL/Timer.h>
+
 #include <CGAL/Periodic_3_Delaunay_triangulation_3.h>
 #include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
 #include <CGAL/Periodic_3_triangulation_3.h>
@@ -60,6 +62,8 @@ template class CGAL::Periodic_3_triangulation_3<PDTT3>;
 
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   typedef CGAL::Periodic_3_triangulation_3<PDTT1>            P3T3_1;
   _test_periodic_3_triangulation_3_constructors( P3T3_1() );
   typedef CGAL::Periodic_3_Delaunay_triangulation_3<PDTT1>   P3DT3_1;
@@ -75,6 +79,7 @@ int main()
 //   typedef CGAL::Periodic_3_Delaunay_triangulation_3<PDTT3>   P3DT3_3;
 //  _test_cls_periodic_3_triangulation_3( P3DT3_3(), false, true );
 
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }
 
diff --git a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_tds.cpp b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_tds.cpp
index a763ed79e52..a97c0c57448 100644
--- a/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_tds.cpp
+++ b/Periodic_3_triangulation_3/test/Periodic_3_triangulation_3/test_periodic_3_triangulation_tds.cpp
@@ -19,6 +19,7 @@
 // Author(s)     : Francois Rebufat
 //                 Manuel Caroli
 
+#include <CGAL/Timer.h>
 #include <CGAL/Triangulation_data_structure_3.h>
 #include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
 #include <CGAL/Periodic_3_triangulation_ds_cell_base_3.h>
@@ -54,6 +55,9 @@ template class CGAL::Triangulation_data_structure_3<
 // periodic vertices and cells fulfill the requirements.
 int main()
 {
+  CGAL::Timer timer;
+  timer.start();
   _test_cls_periodic_3_tds_3(Tds());
+  std::cerr << timer.time() << " sec." << std::endl;
   return 0;
 }