Libgdx problems frame rate (FPS) -

i having problems frame rate in libgdx, alguin enlighten me if i'm doing wrong, because not think normal, problem in question load tilemap , simple , if put highest resolution of 320 x 320, 800 x 600 drops 12 fps or so, hope explain pue groin not native language thanks.

public class mygdxgame extends applicationadapter {  spritebatch batch; texture img;  private orthogonaltiledmaprenderer bachtilemaprender; private orthographiccamera camera; private tiledmap map;  private int[] background = new int[] {0}, foreground = new int[] {1};  @override public void create () {      batch = new spritebatch();      img = new texture("badlogic.jpg");      map = new tmxmaploader().load("maps/untitled.tmx");      bachtilemaprender = new orthogonaltiledmaprenderer(map, 1/32f);//asignar mapa      camera = new orthographiccamera(gdx.graphics.getwidth(),gdx.graphics.getheight());     camera.settoortho(false, 32, 32); //virtual dimensiones  }  @override public void render () {     gdx.gl.glclearcolor(1, 0, 0, 1);     gdx.gl.glclear(gl20.gl_color_buffer_bit);     //batch.begin();     //batch.draw(img, 0, 0);     //batch.end();      camera.update();      bachtilemaprender.setview(camera);     bachtilemaprender.render(background);      system.out.println("fps:"+gdx.graphics.getframespersecond());    } 

}

320 x 320 frame rate 60 climbed window or use 800 x 600 drops rapidly

public class desktoplauncher { public static void main (string[] arg) {     lwjglapplicationconfiguration config = new lwjglapplicationconfiguration();      config.width = 320;     config.height = 320;     new lwjglapplication(new mygdxgame(), config); } 

} p.d: it's worth computer dual core 3000, in debian linux

untitled.tmx

<?xml version="1.0" encoding="utf-8"?> <map version="1.0" orientation="orthogonal" width="32" height="32" tilewidth="32"       tileheight="32"> <tileset firstgid="1" name="prueba" tilewidth="32" tileheight="32"> <image source="title.png" width="384" height="128"/> </tileset> <layer name="capa de patrones 1" width="32" height="32"> <data encoding="base64" compression="zlib">  ejztwwejaaambkhr8f17rsdqcnvuvvxv1w8ar2wb </data> </layer> </map> 

what if this?

//swap these lines map = new tmxmaploader().load("maps/untitled.tmx"); //first load map bachtilemaprender = new orthogonaltiledmaprenderer(map); //then use map  camera.settoortho(false, 800, 600); //x, y, z using aspect ratio want.  //gfx config config.width = 800; config.height = 600; 

also, how many tiles rendering?