I've got a serious issue with my game loop. This loop varies in time with the platform and with the same hardware. This is a list of FPS achieved:

  -  Windows       ======= 140 to 150
  -  Linux         ======= 120 to 125
  -  Windows(WINE) ======= 125 to 135

And since my game loop is fixed timestep, the speed of the game is not stable. Here's my game loop.

public final void run() {
    // Initialize the resources
    Map.initMap();
    initResources();
    // Start the timer
    GTimer.startTimer();
    GTimer.refresh();
    long elapsedTime = 0;
    // The game loop
    while (running) {
        // Update the game
        update(elapsedTime);
        if (state == GameState.GAME_PLAYING) {
            Map.updateObjects(elapsedTime);
        }
        // Show or hide the cursor
        if (Global.HIDE_CURSOR) {
            setCursor(GInput.INVISIBLE_CURSOR);
        } else {
            setCursor(Cursor.getDefaultCursor());
        }
        // Repaint the game and sync
        repaint();
        elapsedTime = GTimer.sync();
        Toolkit.getDefaultToolkit().sync();
    }
}

The timer package

How could I improve it?