diff --git a/src/main.c b/src/main.c
index 88ea71d..569ba4c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,28 +6,30 @@
 #include <CL/cl.h>
 #include <epoxy/gl.h>
 #include <epoxy/glx.h>
-
+#include <time.h>
 
 static const char * const vertex_shader = "#version 330 core\n				\
 		layout (location = 0) in vec3 aPos;\n			\
 		layout (location = 1) in vec2 aTexCoord;\n\
-		out vec2 texCoord;\n							\
+		out vec2 texCoord;\n\
+		out vec3 vertPos;\n							\
 		void main()\n						\
 		{\n							\
 		    gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n	\
 		    texCoord = aTexCoord;\n\
+		    vertPos = aPos;\n\
 		}\n";
 
 static const char * const orange_framgment_shader = "  \
 		#version 330 core\n		\
 		out vec4 FragColor;\n		\
-		in vec4 vertexColor;\n		\
+		in vec3 vertPos;\n		\
 		in vec2 texCoord;\n		\
 		uniform sampler2D ourTexture;\n \
 		\n				\
 		void main()\n			\
 		{\n				\
-		    FragColor = texture(ourTexture, texCoord);\n \
+		    FragColor = texture(ourTexture, texCoord); //+ vec4(vertPos.x, -vertPos.x, vertPos.y, 0.0);\n \
 		}";
 
 struct canvas_buffer {
@@ -147,7 +149,7 @@ static int calculate_mandelbrot(struct canvas_buffer *buff)
 	char *source_code = NULL;
 	char temp_buff[100];
 	size_t data_size;
-	size_t work_size = 10;
+	size_t work_size = 64;
 
 
 	data_size = buff->width*buff->height;
@@ -377,8 +379,8 @@ int main(int argc, char **argv)
 	GtkGLArea *gl_area;
 	GtkWindow *window;
 	GtkBuilder *builder;
-	GtkWidget *temp;
 	static struct canvas_buffer mandelbrot_buff;
+	clock_t start, end;
 
 	gtk_init(&argc, &argv);
 
@@ -388,17 +390,20 @@ int main(int argc, char **argv)
 	g_signal_connect(window, "delete-event", G_CALLBACK(on_main_window_close), NULL);
 
 
-
 	mandelbrot_buff.x_span = 0.075;//2.8;
 	mandelbrot_buff.y_span = 0.075;//2.25;
 	mandelbrot_buff.center_x = -0.6;
 	mandelbrot_buff.center_y = 0.45;
-	mandelbrot_buff.width = 3000;
-	mandelbrot_buff.height = 3000;
-	mandelbrot_buff.iterations = 200;
+	mandelbrot_buff.width = 2000;
+	mandelbrot_buff.height = 2000;
+	mandelbrot_buff.iterations = 400;
 	mandelbrot_buff.mandelbrot_buffer = NULL;
-	calculate_mandelbrot(&mandelbrot_buff);
 
+	printf("Compile and run Mandelbrot on OpenCL HW\n");
+	start = clock();
+	calculate_mandelbrot(&mandelbrot_buff);
+	end = clock();
+	printf("Calculation finished. Time needed: %lf ms\n", ((double) (end - start)) / CLOCKS_PER_SEC * 1000.0);
 
 
 	gl_area = GTK_GL_AREA(gtk_gl_area_new());
@@ -415,6 +420,7 @@ int main(int argc, char **argv)
 
 	gtk_gl_area_make_current(gl_area);
 
+	printf("Gui will be displayed\n");
 
 	gtk_main();