Read it more slowly so as not to overload the system

SlowInputStream.java

public class SlowInputStream extends BufferedInputStream {
  private final long start;
  private final double rate;
  private long read;

  @Override
  public synchronized int read(byte[] b, int off, int len) throws IOException {
    maybeWait();
    int bytes = super.read(b, off, len);
    read += bytes;
    return bytes;
  }

  @Override
  public synchronized int read() throws IOException {
    maybeWait();
    read++;
    return super.read();
  }

  private void maybeWait() {
    double millis = read / rate - (System.currentTimeMillis() - start);
    if (millis > 0) {
      try {
        Thread.sleep((long) millis);
      } catch (InterruptedException e) {
        // Continue
      }
    }
  }

  public SlowInputStream(InputStream in, long length, int time, TimeUnit timeUnit) {
    super(in);
    rate = ((double) length)  / timeUnit.toMillis(time);
    start = System.currentTimeMillis();
  }
}