diff --git a/client/src/main/java/rt4/DisplayMode.java b/client/src/main/java/rt4/DisplayMode.java
index 440e79d..be719d3 100644
--- a/client/src/main/java/rt4/DisplayMode.java
+++ b/client/src/main/java/rt4/DisplayMode.java
@@ -14,7 +14,7 @@ public final class DisplayMode {
 	@OriginalMember(owner = "client!ib", name = "i", descriptor = "[Lclient!od;")
 	public static DisplayMode[] aClass114Array1;
 	@OriginalMember(owner = "client!rc", name = "M", descriptor = "Z")
-	public static boolean aBoolean73 = false;
+	public static boolean start_GLRenderer = false;
 	@OriginalMember(owner = "client!jk", name = "y", descriptor = "Z")
 	public static boolean resizable = false;
 	@OriginalMember(owner = "client!hi", name = "f", descriptor = "J")
@@ -94,6 +94,10 @@ public final class DisplayMode {
 				Preferences.write(GameShell.signLink);
 			}
 		}
+		/**
+		 * If somehow the above code block fails to produce a frame for Fullscreen then this block is a safeguard
+		 * to fall back to Standard Mode.
+ 		 */
 		if (newMode == 3 && GameShell.fullScreenFrame == null) {
 			setWindowMode(true, Preferences.favoriteWorlds, true, currentMode, -1, -1);
 			return;
@@ -125,6 +129,11 @@ public final class DisplayMode {
 			GameShell.canvasWidth = 765;
 			GameShell.canvasHeight = 503;
 		}
+		/**
+		 * This code bock executes for Fullscreen mode and removes current canvas in main frame window
+		 * with a new canvas for the fullscreen frame window. Else if no canvas is replaced then just makes
+		 * size adjustments to current canvas.
+		 */
 		if (replaceCanvas) {
 			Keyboard.stop(GameShell.canvas);
 			Mouse.stop(GameShell.canvas);
@@ -149,12 +158,18 @@ public final class DisplayMode {
 				GameShell.canvas.setLocation(GameShell.leftMargin, GameShell.topMargin);
 			}
 		}
+		/**
+		 * newMode 0 is no mode, so this would be a reset of the canvas and glrenderer
+		 */
 		if (newMode == 0 && currentMode > 0) {
 			GlRenderer.createAndDestroyContext(GameShell.canvas);
 		}
+		/**
+		 *  This Code block starts on mode 1=HD,2=HDResize,3=Fullscreen. It also Starts the GLrenderer.
+		 */
 		if (useHD && newMode > 0) {
 			GameShell.canvas.setIgnoreRepaint(true);
-			if (!aBoolean73) {
+			if (!start_GLRenderer) {
 				SceneGraph.clear();
 				SoftwareRaster.frameBuffer = null;
 				SoftwareRaster.frameBuffer = FrameBuffer.create(GameShell.canvasHeight, GameShell.canvasWidth, GameShell.canvas);
@@ -169,7 +184,7 @@ public final class DisplayMode {
 					SoftwareRaster.frameBuffer.draw(graphics);
 				} catch (@Pc(277) Exception local277) {
 				}
-				GameShell.method2704();
+				GameShell.method2704(); // Creates a black background for SD Mode window, gameplay frame will render on top of.
 				if (currentMode == 0) {
 					if(resizableSD)
 						SoftwareRaster.frameBuffer = FrameBuffer.create(GameShell.frameHeight, GameShell.frameWidth, GameShell.canvas);
@@ -178,22 +193,40 @@ public final class DisplayMode {
 				} else {
 					SoftwareRaster.frameBuffer = null;
 				}
-				@Pc(300) PrivilegedRequest local300 = GameShell.signLink.loadGlNatives(client.instance.getClass());
-				while (local300.status == 0) {
-					ThreadUtils.sleep(100L);
-				}
-				if (local300.status == 1) {
-					aBoolean73 = true;
-				}
+
+				/**
+				 * Code below tries to trigger GLProfile.initSingleton() through a queue in PrivilegedRequest where it waits
+				 * for its turn. This along with the while loop waits long enough to cause a de-sync in the start process which causes
+				 * lag and delay when switching to HD Mode and when launching the client in HD Mode.
+				 * GLProfile.initSingleton() is automatically run starting with jogl 2.0 and later. So no need to execute it.
+				 * After it returns status code 1, it also sets an important variable aBoolean73(Start_Renderer) to true.
+				 * This triggers the needed GLRenderer.init() function which we can control to be true manually as intended.
+				 **/
+
+				/**
+				 @Pc(300) PrivilegedRequest local300 = GameShell.signLink.loadGlNatives(client.instance.getClass());
+				 while (local300.status == 0) {
+				 ThreadUtils.sleep(100L);
+				 }
+				 if (local300.status == 1) {
+				 aBoolean73 = true;
+				 }
+				 */
+
+				start_GLRenderer = true; // Manually set here to allow GLRenderer.init() to execute.
 			}
-			if (aBoolean73) {
+			if (start_GLRenderer) {
 				GlRenderer.init(GameShell.canvas, Preferences.antiAliasingMode * 2);
 			}
 		}
+		// If HD Mode fails, this restarts the whole process to enter into SD Mode
 		if (!GlRenderer.enabled && newMode > 0) {
 			setWindowMode(true, 0, true, currentMode, -1, -1);
 			return;
 		}
+		/**
+		 * Executes once when the client is launched. Doesn't need to be executed more than that.
+		 */
 		if (newMode > 0 && currentMode == 0) {
 			GameShell.thread.setPriority(5);
 			SoftwareRaster.frameBuffer = null;
@@ -203,7 +236,7 @@ public final class DisplayMode {
 				Rasteriser.setBrightness(0.7F);
 			}
 			LoginManager.method4637();
-		} else if (newMode == 0 && currentMode > 0) {
+		} else if (newMode == 0 && currentMode > 0) { // This is when client switches from any other mode to SD Mode
 			GameShell.thread.setPriority(1);
 			if(resizableSD)
 				SoftwareRaster.frameBuffer = FrameBuffer.create(GameShell.frameHeight, GameShell.frameWidth, GameShell.canvas);
@@ -233,7 +266,7 @@ public final class DisplayMode {
 		if (useHD) {
 			client.method2721();
 		}
-		resizable = newMode >= 2;
+		resizable = newMode == 2; // resizeable should only be done in HD-Resizeable mode and not full screen mode.
 		if (InterfaceList.topLevelInterface != -1) {
 			InterfaceList.method3712(true);
 		}
diff --git a/client/src/main/java/rt4/ScriptRunner.java b/client/src/main/java/rt4/ScriptRunner.java
index 24af9ea..cd55e4e 100644
--- a/client/src/main/java/rt4/ScriptRunner.java
+++ b/client/src/main/java/rt4/ScriptRunner.java
@@ -4668,6 +4668,7 @@ public final class ScriptRunner {
 														if (int1 < 0 || int1 > 2) {
 															int1 = 0;
 														}
+														// Gets called on every mode change.
 														DisplayMode.setWindowMode(false, int1, -1, -1);
 														continue;
 													}
diff --git a/client/src/main/java/rt4/client.java b/client/src/main/java/rt4/client.java
index 7a77445..3f897c5 100644
--- a/client/src/main/java/rt4/client.java
+++ b/client/src/main/java/rt4/client.java
@@ -840,6 +840,12 @@ public final class client extends GameShell {
 				DisplayMode.aLong89 = MonotonicClock.currentTimeMillis() + 500L;
 			}
 		}
+		/**
+		 *  If the game is running in fullscreen mode and focus is lost, by alt tab or ctrl alt tab, the client exits
+		 *  fullscreen mode and enters window mode.
+		 *  This line can also be used to launch back into full screen when out of focus and refocused by sending mode 3
+		 *  with the right width and height, by Preference.width and Preference.height for exmaple.
+		 */
 		if (GameShell.fullScreenFrame != null && !GameShell.focus && (gameState == 30 || gameState == 10)) {
 			DisplayMode.setWindowMode(false, Preferences.favoriteWorlds, -1, -1);
 		}
@@ -849,7 +855,7 @@ public final class client extends GameShell {
 			GameShell.fullRedraw = false;
 		}
 		if (local158) {
-			GameShell.method2704();
+			GameShell.method2704(); // Creates a black background for SD Mode gameplay frame to render on top of.
 		}
 		if (GlRenderer.enabled) {
 			for (local80 = 0; local80 < 100; local80++) {
diff --git a/signlink/src/main/java/rt4/SignLink.java b/signlink/src/main/java/rt4/SignLink.java
index fe733a0..abc5caf 100644
--- a/signlink/src/main/java/rt4/SignLink.java
+++ b/signlink/src/main/java/rt4/SignLink.java
@@ -410,7 +410,7 @@ public final class SignLink implements Runnable {
 					}
 					request.result = ((Class) args[0]).getDeclaredField((String) args[1]);
 				} else if (type == 10) {
-					GLProfile.initSingleton();
+					//GLProfile.initSingleton(); //this is no longer necessary with jogl versions 2.0+.
 				} else if (type == 11) {
 					GLProfile.shutdown();
 				} else if (type == 12) {