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    <p>i think the answer by @mantrid should fix your problem. as far as performance goes ... there are some obvious "sins" in your code: </p> <p><strong>Don't draw an image into an image to draw an image</strong></p> <pre><code>public void drawImage(BufferedImage img, double x, double y, double scale){ x -= xScroll; y -= yScroll; BufferedImage image = new BufferedImage((int)(img.getWidth()*scale), (int)(img.getHeight()*scale), BufferedImage.TYPE_INT_ARGB); Graphics g = image.getGraphics(); g.drawImage(img, 0, 0, (int)(img.getWidth()*scale), (int)(img.getHeight()*scale), null); g2d.drawImage(image, (int)x, (int)y, null); g.dispose(); } </code></pre> <p>I don't see the point of this. Why not just do this: </p> <pre><code>public void drawImage(BufferedImage img, double x, double y, double scale){ g2d.drawImage(img, (int)(x-xScroll), (int)(y-yScroll), (int)(img.getWidth()*scale), (int)(img.getHeight()*scale), null); } </code></pre> <p><strong>AAAAAAAAAAAAA</strong></p> <p>The next one actually burnt my eyes </p> <pre><code>public void drawRectangle(double x, double y, int xs, int ys, int colour){ if(xs &lt;= 0){ return; } x -= xScroll; y -= yScroll; BufferedImage image = new BufferedImage(xs, ys, BufferedImage.TYPE_INT_RGB); Graphics2D g = (Graphics2D) image.getGraphics(); g.setColor(new Color(colour)); g.fillRect(0, 0, xs, ys); g2d.drawImage(image, (int)x, (int)y, null); g.dispose(); } </code></pre> <p>Why? This is so much simpler and quicker: </p> <pre><code>public void drawRectangle(double x, double y, int xs, int ys, int colour){ if(xs &lt;= 0) return; g2d.setColor(new Color(colour)); g2d.fillRect((int)(x-xScroll), (int)(y-yScroll), xs, ys); } </code></pre> <p>The same goes for the <code>drawImageRotated</code> and <code>drawString</code>. Just draw to the g2d buffer directly, what are you afraid of? </p> <p><strong>drawImageBlurred</strong></p> <p>First of all... you're doing it again! Second: You seem to be applying a convolve operation to an image on each frame, why not just do that operation once (e.g. at the start of the app, or even better yet, in an image editing program). </p> <p>I don't mean this in a bad way at all, but you are clearly not very experienced with programming in general. I think you could take a look at processing (<a href="http://processing.org">http://processing.org</a>). I'm sort of biased here because i'm using it myself almost everyday. It is a great learning and prototyping environment written in java that should allow you to stop thinking about implementation details (like flipping buffers) and focus on what you really care for (make a game!). </p> <p>Alright, hope what i said makes sense. Good luck with your coding! :) </p>
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    1. COThank you for this feedback. I drew the image onto the image as I was worried about the Graphics transformations affecting one another, I know now how to use the AffineTransform to restore an old transformation to the Graphics object. And by the way, the x -= xScroll had to be there as the game is a side scroller. After fixing up all my code from it's hideous former state, my game still seems to experience lag but it's generally a lot nicer. Thank you :)
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