diff --git a/sandboxes/opencsg/CMakeLists.txt b/sandboxes/opencsg/CMakeLists.txt
index 145912431..a6256250d 100644
--- a/sandboxes/opencsg/CMakeLists.txt
+++ b/sandboxes/opencsg/CMakeLists.txt
@@ -11,10 +11,8 @@ find_package(wxWidgets 3.1 REQUIRED COMPONENTS core base gl html)
 find_package(OpenGL REQUIRED)
 find_package(GLEW REQUIRED)
 find_package(OpenCSG REQUIRED)
- find_package(GLUT REQUIRED)
 include(${wxWidgets_USE_FILE})
 
-
 target_link_libraries(opencsg_example libslic3r)
 target_include_directories(opencsg_example PRIVATE ${wxWidgets_INCLUDE_DIRS})
 target_compile_definitions(opencsg_example PRIVATE ${wxWidgets_DEFINITIONS})
@@ -22,7 +20,6 @@ target_compile_definitions(opencsg_example PRIVATE ${wxWidgets_DEFINITIONS})
 target_link_libraries(opencsg_example ${wxWidgets_LIBRARIES} 
     OpenCSG::opencsg 
     GLEW::GLEW
-    GLUT::GLUT
     OpenGL::GL 
     #-lXrandr -lXext -lX11
     )
diff --git a/sandboxes/opencsg/GLScene.cpp b/sandboxes/opencsg/GLScene.cpp
index 9df3b601e..5744e8be7 100644
--- a/sandboxes/opencsg/GLScene.cpp
+++ b/sandboxes/opencsg/GLScene.cpp
@@ -1,5 +1,3 @@
-#include <chrono>
-
 #include "GLScene.hpp"
 #include <libslic3r/Utils.hpp>
 #include <libslic3r/SLAPrint.hpp>
@@ -7,12 +5,6 @@
 
 #include <GL/glew.h>
 
-#ifdef __APPLE__
-#include <GLUT/glut.h>
-#else
-#include <GL/glut.h>
-#endif
-
 #include <boost/log/trivial.hpp>
 
 #ifndef NDEBUG
@@ -54,60 +46,8 @@ inline void glAssertRecentCall() { }
 namespace Slic3r { namespace GL {
 
 Scene::Scene() = default;
-
 Scene::~Scene() = default;
 
-void renderfps () {
-    using Clock = std::chrono::high_resolution_clock;
-    using Duration = Clock::duration;
-    using TimePoint = Clock::time_point;
-    
-    static std::ostringstream fpsStream;
-    static int frames = 0;
-    static TimePoint last = Clock::now();
-    
-    static const double resolution = 0.01;
-    static double fps = 0.;
-    
-    auto to_sec = [](Duration d) -> double {
-        return d.count() * double(Duration::period::num) / Duration::period::den;
-    };
-    
-    ++frames;
-    
-    TimePoint msec = Clock::now();
-    double seconds = to_sec(msec - last);
-    if (seconds >= resolution) {
-        last = msec;
-        
-        fps = 0.5 * (fps + frames / seconds);
-        
-        fpsStream.str("");
-        fpsStream << "fps: " << std::setprecision(4) << fps << std::ends;
-        
-        frames = 0;
-    }
-    
-    glDisable(GL_DEPTH_TEST);
-    glLoadIdentity();
-    glMatrixMode(GL_PROJECTION);
-    glPushMatrix();
-    glLoadIdentity();
-    glColor3f(0.0f, 0.0f, 0.0f);
-    glRasterPos2f(-1.0f, -1.0f);
-    glDisable(GL_LIGHTING);
-    std::string s = fpsStream.str();
-    for (unsigned int i=0; i<s.size(); ++i) {
-        glutBitmapCharacter(GLUT_BITMAP_8_BY_13, s[i]);
-    }
-    glEnable(GL_LIGHTING);
-    glPopMatrix();
-    glMatrixMode(GL_MODELVIEW);
-    glEnable(GL_DEPTH_TEST);
-    
-    glFlush();
-}
-
 void Display::render_scene()
 {
     GLfloat color[] = {1.f, 1.f, 0.f, 0.f};
@@ -367,12 +307,9 @@ Display::~Display()
 }
 
 void Display::set_active(long width, long height)
-{
-    static int argc = 0;
-    
+{   
     if (!m_initialized) {
         glewInit();
-        glutInit(&argc, nullptr);
         m_initialized = true;
     }
 
@@ -415,7 +352,8 @@ void Display::repaint()
     m_camera->view();
     render_scene();
     
-    renderfps(); 
+//    renderfps();
+    m_fps_counter.update();
     
     swap_buffers();
 }
diff --git a/sandboxes/opencsg/GLScene.hpp b/sandboxes/opencsg/GLScene.hpp
index 62863dc0b..4fd524af2 100644
--- a/sandboxes/opencsg/GLScene.hpp
+++ b/sandboxes/opencsg/GLScene.hpp
@@ -3,6 +3,7 @@
 
 #include <vector>
 #include <memory>
+#include <chrono>
 
 #include <libslic3r/Geometry.hpp>
 #include <libslic3r/Model.hpp>
@@ -211,6 +212,60 @@ public:
     void set_clip_z(double z) { m_clip_z = z; }
 };
 
+class FpsCounter {
+    vector<std::function<void(double)>> m_listeners;
+    
+    using Clock = std::chrono::high_resolution_clock;
+    using Duration = Clock::duration;
+    using TimePoint = Clock::time_point;
+    
+    int m_frames = 0;
+    TimePoint m_last = Clock::now(), m_window = m_last;
+    
+    double m_resolution = 0.1, m_window_size = 1.0;
+    double m_fps = 0.;
+    
+    static double to_sec(Duration d)
+    {
+        return d.count() * double(Duration::period::num) / Duration::period::den;
+    }    
+    
+public:
+    
+    void update()
+    {
+        ++m_frames;
+        
+        TimePoint msec = Clock::now();
+        
+        double seconds_window = to_sec(msec - m_window);
+        m_fps = 0.5 * m_fps + 0.5 * (m_frames / seconds_window);
+        
+        if (to_sec(msec - m_last) >= m_resolution) {
+            m_last = msec;
+            for (auto &l : m_listeners) l(m_fps);
+        }
+        
+        if (seconds_window >= m_window_size) {
+            m_frames = 0;
+            m_window = msec;
+        }
+    }
+
+    void add_listener(std::function<void(double)> lst)
+    {
+        m_listeners.emplace_back(lst);
+    }
+    
+    void clear_listeners() { m_listeners = {}; }
+
+    void set_notification_interval(double seconds);
+    void set_measure_window_size(double seconds);
+    
+    double get_notification_interval() const { return m_resolution; }
+    double get_mesure_window_size() const { return m_window_size; }
+};
+
 class PerspectiveCamera: public Camera {
 public:
     
@@ -296,6 +351,7 @@ protected:
     } m_scene_cache;
     
     shptr<Camera>  m_camera;
+    FpsCounter m_fps_counter;
     
 public:
     
@@ -323,6 +379,14 @@ public:
     
     virtual void clear_screen();
     virtual void render_scene();
+    
+    template<class _FpsCounter> void set_fps_counter(_FpsCounter &&fpsc)
+    {
+        m_fps_counter = std::forward<_FpsCounter>(fpsc);
+    }
+
+    const FpsCounter &get_fps_counter() const { return m_fps_counter; }
+    FpsCounter &get_fps_counter() { return m_fps_counter; }
 };
 
 class Controller : public std::enable_shared_from_this<Controller>,
diff --git a/sandboxes/opencsg/main.cpp b/sandboxes/opencsg/main.cpp
index 3f764fe62..28aa89f6d 100644
--- a/sandboxes/opencsg/main.cpp
+++ b/sandboxes/opencsg/main.cpp
@@ -240,6 +240,12 @@ MyFrame::MyFrame(const wxString &title, const wxPoint &pos, const wxSize &size):
     auto optimization_select = add_combobox("Optimization", { "Default", "ForceOn", "On", "Off" });
     depth_select->Disable();
     
+    auto fpstext = new wxStaticText(control_panel, wxID_ANY, "");
+    console_sizer->Add(fpstext, 0, wxALL, 5);
+    m_canvas->get_fps_counter().add_listener([fpstext](double fps) {
+        fpstext->SetLabel(wxString::Format("fps: %.2f", fps) ); 
+    });
+    
     controlsizer->Add(slider_sizer, 0, wxEXPAND);
     controlsizer->Add(console_sizer, 1, wxEXPAND);