title: Is Java's System.arraycopy() efficient for small arrays?
body: <p>Is Java's <code>System.arraycopy()</code> efficient for small arrays, or does the fact that it's a native method make it likely to be substantially less efficient than a simple loop and a function call?  </p>
  
  <p>Do native methods incur additional performance overhead for crossing some kind of Java-system bridge?</p>