title: Slick2D game speed changing
body: <p>I created a game using Swing, and it was a bit unreliable, so I started remaking it using Slick2D game engine and I have encountered issues.</p>
  
  <p>The background of the game rolls across the screen at a certain about of pixels each time the update method is called. This keeps speeding up and slowing down, so the background will move very fast, and then very slow, and keeps fluctuating.</p>
  
  <p>I have tried * by delta (which monitors the refresh rate, I think!) on my value which moves the background, but as this wont give me an exact value I can use to reset the background to the left hand side (2 background move from right to left. left hand one goes to the right at -800 pixels).</p>
  
  <p>What is causing this and how do I overcome it?</p>
  
  <p>Thanks</p>