diff --git a/main.cpp b/main.cpp
index b3e1465..bf83600 100644
--- a/main.cpp
+++ b/main.cpp
@@ -6,7 +6,9 @@
 #include <QApplication>
 #include <QImage>
 #include <QLabel>
+#include <QObject>
 #include <QPixmap>
+#include <QTimer>
 #include <chrono>
 #include <functional>
 #include <math.h>
@@ -102,26 +104,53 @@ int main(int argc, char *argv[]) {
         }
     };
 
-    for (int x = 0; x < 64; x++) {
-        for (int y = 0; y < 64; y++) {
-            uint32_t result[3] = {};
-            addTo((target.width * y * 2 + x * 2) * 3, result);
-            addTo((target.width * (y * 2 + 1) + x * 2) * 3, result);
-            addTo((target.width * y * 2 + (x * 2 + 1)) * 3, result);
-            addTo((target.width * (y * 2 + 1) + (x * 2 + 1)) * 3, result);
-            for (int c = 0; c < 3; c++) {
-                pixel[(WIDTH * (WIDTH - y - 1) + WIDTH - x - 1) * 3 + c] =
-                    result[c] >> 2;
-            }
-        }
-    }
     QApplication a(argc, argv);
     QWidget widget;
     widget.setAutoFillBackground(true);
     widget.setGeometry(0, 0, 500, 500);
     QLabel display(&widget);
     QImage img((unsigned char *)pixel, 64, 64, QImage::Format_RGB888);
-    display.setPixmap(QPixmap::fromImage(img).scaled(widget.size()));
+
+    // display.setPixmap(QPixmap::fromImage(img).scaled(widget.size()));
+
+    float rot = 0.f;
+    std::function<void()> renderLoop = [&addTo, &target, &pixel, &renderer,
+                                        &display, &widget, &img, &rot]() {
+        std::chrono::steady_clock::time_point begin =
+            std::chrono::steady_clock::now();
+        renderer.render(&testModel, mat4::translation(vec3(0.0f, -1.0f, 5.0f)) *
+                                        mat4::rotateOnY(rot));
+        std::chrono::steady_clock::time_point end =
+            std::chrono::steady_clock::now();
+
+        std::cout << "Time difference = "
+                  << std::chrono::duration_cast<std::chrono::milliseconds>(
+                         end - begin)
+                         .count()
+                  << "[ms]" << std::endl;
+
+        for (int x = 0; x < 64; x++) {
+            for (int y = 0; y < 64; y++) {
+                uint32_t result[3] = {};
+                addTo((target.width * y * 2 + x * 2) * 3, result);
+                addTo((target.width * (y * 2 + 1) + x * 2) * 3, result);
+                addTo((target.width * y * 2 + (x * 2 + 1)) * 3, result);
+                addTo((target.width * (y * 2 + 1) + (x * 2 + 1)) * 3, result);
+                for (int c = 0; c < 3; c++) {
+                    pixel[(WIDTH * (WIDTH - y - 1) + WIDTH - x - 1) * 3 + c] =
+                        result[c] >> 2;
+                }
+            }
+        }
+        // QImage img((unsigned char *)pixel, 64, 64, QImage::Format_RGB888);
+        display.setPixmap(QPixmap::fromImage(img).scaled(widget.size() * 1));
+        rot += 0.1f;
+    };
+    renderLoop();
     widget.show();
+    QTimer timer;
+    timer.setInterval(20);
+    timer.start();
+    QObject::connect(&timer, &QTimer::timeout, &widget, renderLoop);
     return a.exec();
 }