diff --git a/Cargo.lock b/Cargo.lock
index 49cbff7..d22a960 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -666,15 +666,16 @@ version = "0.1.0"
 dependencies = [
  "png",
  "rand",
+ "rayon",
  "sorted-vec",
  "thousands",
 ]
 
 [[package]]
 name = "rayon"
-version = "1.8.1"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa7237101a77a10773db45d62004a272517633fbcc3df19d96455ede1122e051"
+checksum = "e4963ed1bc86e4f3ee217022bd855b297cef07fb9eac5dfa1f788b220b49b3bd"
 dependencies = [
  "either",
  "rayon-core",
diff --git a/img/menger_castle_scene.png b/img/menger_castle_scene.png
index ed59743..80edf22 100644
Binary files a/img/menger_castle_scene.png and b/img/menger_castle_scene.png differ
diff --git a/ray-tracer-cli/src/scenes/menger_scene.rs b/ray-tracer-cli/src/scenes/menger_scene.rs
index 3f6a63d..9db8172 100644
--- a/ray-tracer-cli/src/scenes/menger_scene.rs
+++ b/ray-tracer-cli/src/scenes/menger_scene.rs
@@ -67,7 +67,7 @@ impl Scene for MengerCastleScene {
         floor.set_material(material_floor.clone());
         world.objects.push(floor);
 
-        let menger_sponge = MengerSponge::new(3);
+        let menger_sponge = MengerSponge::new(4);
         let mut cube = build_cube();
         cube.set_transformation(&scaling(2.0, 1.0, 2.0) * &translation(0.0, 1.0, 0.0));
 
diff --git a/ray-tracer-lib/Cargo.toml b/ray-tracer-lib/Cargo.toml
index 0c510be..41966ce 100644
--- a/ray-tracer-lib/Cargo.toml
+++ b/ray-tracer-lib/Cargo.toml
@@ -8,4 +8,5 @@ edition = "2021"
 sorted-vec = "0.8.3"
 rand = { version = "0.8.5", features = [] }
 png = { version = "0.17.11", features = [] }
-thousands = {version = "0.2.0"}
\ No newline at end of file
+thousands = {version = "0.2.0"}
+rayon = {  version = "1.9.0"}
\ No newline at end of file
diff --git a/ray-tracer-lib/src/camera.rs b/ray-tracer-lib/src/camera.rs
index 8832902..d9ed452 100644
--- a/ray-tracer-lib/src/camera.rs
+++ b/ray-tracer-lib/src/camera.rs
@@ -1,7 +1,8 @@
 use io::stdout;
 use std::io;
 use std::io::Write;
-use std::sync::atomic::Ordering;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use rayon::prelude::*;
 use crate::canvas::Canvas;
 use crate::core::math::Float;
 use crate::core::matrix::Matrix;
@@ -10,6 +11,9 @@ use crate::core::tuple::point;
 use crate::object::{INTERSECTION_COUNTER, OBJECT_COUNTER};
 use crate::world::World;
 use thousands::Separable;
+use crate::colors::Color;
+use std::time::{Instant};
+use std::sync::{Arc, Mutex};
 
 pub struct Camera {
     pub h_size: usize,
@@ -22,6 +26,20 @@ pub struct Camera {
     pub inverse_transform: Matrix<4>,
 }
 
+pub struct Pixel {
+    x : usize,
+    y : usize,
+    color : Color,
+}
+
+pub struct Block {
+    x_min : usize,
+    x_max : usize,
+    y_min : usize,
+    y_max : usize,
+    pixels : Vec<Pixel>
+}
+
 impl Camera {
     pub fn new(h_size: usize, v_size: usize, field_of_view: Float) -> Camera {
         let half_view = (field_of_view / 2.0).tan() as Float;
@@ -67,6 +85,62 @@ impl Camera {
     }
 
     pub fn render(&self, world: &World, file_path: &str) -> Canvas {
+        let mut blocks: Vec<Block> = vec![];
+        let n = 20;
+        let nx = self.v_size / n;
+        let ny = self.h_size / n;
+
+        for i in 0..nx {
+            for j in 0..ny {
+                let block = Block {
+                    x_min: usize::min(i * n, self.v_size-1),
+                    x_max: usize::min((i+1) * n, self.v_size-1),
+                    y_min: usize::min(j * n, self.h_size-1),
+                    y_max: usize::min((j+1) * n, self.h_size-1),
+                    pixels: vec![],
+                };
+                blocks.push(block);
+            }
+        }
+
+        let num_block = AtomicUsize::new(0);
+        let num_pixel = AtomicUsize::new(0);
+        let nb_objects = OBJECT_COUNTER.load(Ordering::Relaxed).separate_with_commas();
+        let start = Arc::new(Mutex::new(Instant::now()));
+
+        let mut image = Canvas::new(self.h_size, self.v_size);
+        blocks.par_iter_mut().for_each(|block| {
+            num_block.fetch_add(1, Ordering::SeqCst);
+            for x in block.x_min..block.x_max {
+                for y in block.y_min..block.y_max {
+                    let ray = self.ray_for_pixel(x, y);
+                    let color = world.color_at(&ray, 5);
+                    let pixel = Pixel { x, y, color };
+                    block.pixels.push(pixel);
+                    let nb_pixels = num_pixel.fetch_add(1, Ordering::SeqCst);
+                    let mut guard = start.lock().unwrap();
+                    let t = guard.elapsed().as_secs();
+                    if t > 1 {
+                        let pct= nb_pixels as f32 / (self.v_size*self.h_size) as f32 * 100.0;
+                        print!("\r{:3.2} % - {} / {} - {} - {} inters - {} Objs, {}", pct, nb_pixels, self.v_size*self.h_size, file_path, INTERSECTION_COUNTER.load(Ordering::Relaxed).separate_with_commas(), OBJECT_COUNTER.load(Ordering::Relaxed).separate_with_commas(), nb_objects);
+                        let _ = stdout().flush();
+                        *guard = Instant::now();
+                    }
+                }
+            }
+        });
+
+        for block in blocks.iter() {
+            for pixel in block.pixels.iter() {
+                image.write_pixel(pixel.x, pixel.y, pixel.color);
+            }
+        }
+
+        println!();
+        image
+    }
+
+    pub fn _render(&self, world: &World, file_path: &str) -> Canvas {
         let mut image = Canvas::new(self.h_size, self.v_size);
         let nb_objects = OBJECT_COUNTER.load(Ordering::Relaxed).separate_with_commas();