diff --git a/DLASystem.cpp b/DLASystem.cpp
index 0011eff..5a1dec6 100644
--- a/DLASystem.cpp
+++ b/DLASystem.cpp
@@ -4,31 +4,18 @@
 
 #include "DLASystem.h"
 
-// colors
-namespace colours {
-    GLfloat blue[] = {0.1, 0.3, 0.9, 1.0};   // blue
-    GLfloat red[] = {1.0, 0.2, 0.1, 0.2};   // red
-    GLfloat green[] = {0.3, 0.6, 0.3, 1.0};     // green
-    GLfloat paleGrey[] = {0.7, 0.7, 0.7, 1.0};     // green
-    GLfloat darkGrey[] = {0.2, 0.2, 0.2, 1.0};     // green
-}
-
-
 // this function gets called every step,
 //   if there is an active particle then it gets moved,
 //   if not then add a particle
 void DLASystem::Update() {
-    if (lastParticleIsActive == 1)
+    if (lastParticleIsActive == 1) {
         moveLastParticle();
-    else if (numParticles < endNum) {
+    } else if (numParticles < endNum) {
         addParticleOnAddCircle();
         setParticleActive();
     }
-    if (lastParticleIsActive == 0 || slowNotFast == 1)
-        glutPostRedisplay(); //Tell GLUT that the display has changed
 }
 
-
 void DLASystem::clearParticles() {
     // delete particles and the particle list
     for (int i = 0; i < numParticles; i++) {
@@ -88,7 +75,6 @@ int DLASystem::checkStop() {
     if (killCircle + 2 >= gridSize / 2) {
         pauseRunning();
         cout << "STOP" << endl;
-        glutPostRedisplay(); // update display
         return 1;
     } else return 0;
 }
@@ -239,9 +225,8 @@ int DLASystem::checkStick() {
 
 
 // constructor
-DLASystem::DLASystem(Window *set_win) {
+DLASystem::DLASystem() {
     cout << "creating system, gridSize " << gridSize << endl;
-    win = set_win;
     numParticles = 0;
     endNum = 1000;
 
@@ -275,42 +260,3 @@ DLASystem::~DLASystem() {
     if (logfile.is_open())
         logfile.close();
 }
-
-
-// this draws the system
-void DLASystem::DrawSquares() {
-
-    // draw the particles
-    double halfSize = 0.5;
-    for (int p = 0; p < numParticles; p++) {
-        double *vec = particleList[p]->pos;
-        glPushMatrix();
-        if (p == numParticles - 1 && lastParticleIsActive == 1)
-            glColor4fv(colours::red);
-        else if (p == 0)
-            glColor4fv(colours::green);
-        else
-            glColor4fv(colours::blue);
-        glRectd(drawScale * (vec[0] - halfSize),
-                drawScale * (vec[1] - halfSize),
-                drawScale * (vec[0] + halfSize),
-                drawScale * (vec[1] + halfSize));
-        glPopMatrix();
-    }
-
-    // print some information (at top left)
-    // this ostringstream is a way to create a string with numbers and words (similar to cout << ... )
-    ostringstream str;
-    str << "num " << numParticles << " size " << clusterRadius;
-
-    // print the string
-    win->displayString(str, -0.9, 0.9, colours::red);
-
-    // if we are paused then print this (at bottom left)
-    if (running == 0) {
-        ostringstream pauseStr;
-        pauseStr << "paused";
-        win->displayString(pauseStr, -0.9, -0.9, colours::red);
-    }
-
-}
diff --git a/DLASystem.h b/DLASystem.h
index b0f5857..39660e6 100644
--- a/DLASystem.h
+++ b/DLASystem.h
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <GLUT/glut.h>
 #include <iostream>
 #include <fstream>
 #include <stdio.h>
@@ -13,7 +12,6 @@
 #include <string>
 #include <sstream>
 
-#include "Window.h"
 #include "Particle.h"
 #include "rnd.h"
 
@@ -23,9 +21,6 @@ using namespace std;
 class DLASystem {
 private:
     // these are private variables and functions that the user will not see
-
-    Window *win;  // window in which the system is running
-
     // list of particles
     vector<Particle *> particleList;
     int numParticles;
@@ -69,9 +64,6 @@ public:
     // else create a new particle (on the adding circle)
     void Update();
 
-    // draw particles as squares
-    void DrawSquares();
-
     // is the simulation running (1) or paused (0) ?
     int running;
 
@@ -82,7 +74,7 @@ public:
     int lastParticleIsActive;
 
     // constructor
-    DLASystem(Window *set_win);
+    DLASystem();
 
     // destructor
     ~DLASystem();
@@ -97,7 +89,7 @@ public:
     int checkStop();
 
     // stop/start the algorithm
-    void setRunning() { if (checkStop() == 0) running = 1; }
+    void setRunning() { if (checkStop() == true) running = 1; }
 
     void pauseRunning() { running = 0; }
 
@@ -158,11 +150,4 @@ public:
     // check whether the last particle should stick
     // currently it sticks whenever it touches another particle
     int checkStick();
-
-    // set the background colour for the window
-    // it would be better for an OOP philosophy to make these member functions for the Window class
-    // but we are being a bit lazy here
-    void setWinBackgroundWhite() { glClearColor(1.0, 1.0, 1.0, 1.0); }
-
-    void setWinBackgroundBlack() { glClearColor(0.0, 0.0, 0.0, 0.0); }
 };
diff --git a/mainDLA.cpp b/mainDLA.cpp
index 7c66563..106b701 100644
--- a/mainDLA.cpp
+++ b/mainDLA.cpp
@@ -6,19 +6,6 @@
 
 #include "DLASystem.h"
 
-using namespace std;
-
-// functions which are needed for openGL go into a namespace so that we can identify them
-namespace drawFuncs {
-    void handleKeypress(unsigned char key, int x, int y);
-
-    void display(void);
-
-    void update(int val);
-
-    void introMessage();
-}
-
 // this is a global pointer, which is how we access the system itself
 DLASystem *sys;
 
@@ -30,8 +17,13 @@ int main(int argc, char **argv) {
     int seed = 6;
     cout << "setting seed " << seed << endl;
     sys->setSeed(seed);
+    sys->setRunning();
 
-    while (sys->Update()) {
+    /*
+     * NOTE: We run at max speed as rendering is handled by a different engine so we simply want to hjand
+     * */
+    while (sys->running) {
+        sys->Update();
     }
 
     return 0;