diff --git a/engine/sdl2.py b/engine/sdl2.py
index 497ed58..0e0286a 100644
--- a/engine/sdl2.py
+++ b/engine/sdl2.py
@@ -12,10 +12,10 @@ class GameWindow:
         self.width = width * cell_size
         self.height = height * cell_size
         self.delay = 50
-        sdl2.ext.init()
+        sdl2.ext.init(sdl2.SDL_INIT_VIDEO)
         self.window = sdl2.ext.Window(title=title, size=(self.width, self.height))
         self.window.show()
-        self.renderer = sdl2.ext.Renderer(self.window, flags=sdl2.SDL_RENDERER_ACCELERATED)
+        self.renderer = sdl2.ext.Renderer(self.window, flags=sdl2.SDL_RENDERER_PRESENTVSYNC)
         self.factory = sdl2.ext.SpriteFactory(renderer=self.renderer)
         self.fonts = self.generate_fonts("assets/AmaticSC-Regular.ttf")
         self.running = True
@@ -84,4 +84,4 @@ class GameWindow:
                     self.running = False
             # Disegna qui gli sprite
             self.renderer.present()
-            time.sleep(self.delay / 1000)
+            #time.sleep(self.delay / 1000)
diff --git a/rats.py b/rats.py
index da9969d..3fb5337 100644
--- a/rats.py
+++ b/rats.py
@@ -1,3 +1,5 @@
+import cProfile
+import pstats
 import random
 from units import rat
 import uuid
@@ -7,11 +9,13 @@ from engine import maze, sdl2 as engine
 class MiceMaze:
     def __init__(self, maze_file):
         self.map = maze.Map(maze_file)
-        self.audio = True
+        self.audio = False
         self.cell_size = 60
         self.engine = engine.GameWindow(self.map.width, self.map.height, self.cell_size, "Mice!", key_callback=self.key_pressed)
         self.graphics_load()
         self.units = {}
+        self.unit_positions = {}
+        self.unit_positions_before = {}
         for _ in range(5):
             self.new_rat()
 
@@ -40,6 +44,11 @@ class MiceMaze:
 
     def update_maze(self):
         self.engine.delete_tag("unit")
+        self.unit_positions.clear()
+        self.unit_positions_before.clear()
+        for unit in self.units.values():
+            self.unit_positions.setdefault(unit.position, []).append(unit)
+            self.unit_positions_before.setdefault(unit.position_before, []).append(unit)
         for unit in self.units.copy().values():
             unit.move()
             unit.collisions()
@@ -62,6 +71,10 @@ class MiceMaze:
                 self.units[random.choice(list(self.units.keys()))].die()
         elif event.keysym == "m":
             self.audio = not self.audio
+        elif event.keysym == "s":
+            profiler.disable()
+            stats = pstats.Stats(profiler).sort_stats('cumtime')
+            stats.print_stats()
 
     def play_sound(self, sound_file):
         if self.audio:
@@ -75,5 +88,10 @@ class MiceMaze:
             self.rat_assets[sex] = {}
             for direction in ["UP", "DOWN", "LEFT", "RIGHT"]:
                 self.rat_assets[sex][direction] = self.engine.load_image(f"Rat/BMP_{sex}_{direction}.png", transparent_color=(128, 128, 128))
-solver = MiceMaze('maze.json')
-solver.run()
+if __name__ == "__main__":
+    profiler = cProfile.Profile()
+    profiler.enable()
+    
+    solver = MiceMaze('maze.json')
+    solver.run()
+    
diff --git a/sdl2-tk-demo.py b/sdl2-tk-demo.py
new file mode 100644
index 0000000..c16f5ad
--- /dev/null
+++ b/sdl2-tk-demo.py
@@ -0,0 +1,50 @@
+from sdl2 import *
+import tkinter as tk
+from tkinter import *
+import random, ctypes
+
+def draw():
+    global renderer
+    x1 = ctypes.c_int(random.randrange(0, 600))
+    y1 = ctypes.c_int(random.randrange(0, 500))
+    x2 = ctypes.c_int(random.randrange(0, 600))
+    y2 = ctypes.c_int(random.randrange(0, 500))
+    r = ctypes.c_ubyte(random.randrange(0, 255))
+    g = ctypes.c_ubyte(random.randrange(0, 255))
+    b = ctypes.c_ubyte(random.randrange(0, 255))
+    SDL_SetRenderDrawColor(renderer, r, g, b, ctypes.c_ubyte(255))
+    SDL_RenderDrawLine(renderer, x1, y1, x2, y2)
+
+def sdl_update():
+    global window, event, renderer
+    SDL_RenderPresent(renderer);
+    if SDL_PollEvent(ctypes.byref(event)) != 0:
+        if event.type == SDL_QUIT:
+            SDL_DestroyRenderer(renderer)
+            SDL_DestroyWindow(window)
+            SDL_Quit()
+
+# tkinter stuff #
+root = tk.Tk()
+embed = tk.Frame(root, width = 500, height = 500) #creates embed frame for pygame window
+embed.grid(columnspan = (600), rowspan = 500) # Adds grid
+embed.pack(side = LEFT) #packs window to the left
+buttonwin = tk.Frame(root, width = 75, height = 500)
+buttonwin.pack(side = LEFT)
+button1 = Button(buttonwin,text = 'Draw',  command=draw)
+button1.pack(side=LEFT)
+root.update()
+#################################
+# SDL window stuff #
+SDL_Init(SDL_INIT_VIDEO)
+window = SDL_CreateWindowFrom(embed.winfo_id())
+renderer = SDL_CreateRenderer(window, -1, 0)
+SDL_SetRenderDrawColor(renderer, ctypes.c_ubyte(255), ctypes.c_ubyte(255), 
+                                ctypes.c_ubyte(255), ctypes.c_ubyte(255))
+SDL_RenderClear(renderer)
+event = SDL_Event()
+draw()
+
+while True:
+    sdl_update()
+    root.update()
\ No newline at end of file
diff --git a/units/__pycache__/rat.cpython-313.pyc b/units/__pycache__/rat.cpython-313.pyc
index ba90b4b..d202cc5 100644
Binary files a/units/__pycache__/rat.cpython-313.pyc and b/units/__pycache__/rat.cpython-313.pyc differ
diff --git a/units/rat.py b/units/rat.py
index 67c1e4a..8729553 100644
--- a/units/rat.py
+++ b/units/rat.py
@@ -1,7 +1,6 @@
 from .unit import Unit
 import random
 import uuid
-from engine.tkinter import GameWindow
 
 # Costanti
 AGE_THRESHOLD = 200
@@ -55,16 +54,14 @@ class Rat(Unit):
         self.age += 1
         if self.age == AGE_THRESHOLD:
             self.speed *= SPEED_REDUCTION
-        if hasattr(self, "pregnant"):
-            if self.pregnant:
-                self.procreate()
+        if getattr(self, "pregnant", False):
+            self.procreate()
         if self.stop:
             self.stop -= 1
             return
         if self.partial_move < 1:
-            self.partial_move += self.speed
-            self.partial_move = round(self.partial_move, 2)
-        if self.partial_move == 1:
+            self.partial_move = round(self.partial_move + self.speed, 2)
+        if self.partial_move >= 1:
             self.partial_move = 0
             self.position = self.find_next_position()
         self.direction = self.calculate_rat_direction()
@@ -72,27 +69,29 @@ class Rat(Unit):
     def collisions(self):
         if self.age < AGE_THRESHOLD:
             return
-        units = self.game.units.copy().values()
+        units = []
+        units.extend(self.game.unit_positions.get(self.position, []))
+        units.extend(self.game.unit_positions.get(self.position_before, []))
+        units.extend(self.game.unit_positions_before.get(self.position, []))
+        units.extend(self.game.unit_positions_before.get(self.position_before, []))
+        
         for unit in units:
-            if unit.id == self.id:
-                continue
-            if unit.age < AGE_THRESHOLD:
+            if unit.id == self.id or unit.age < AGE_THRESHOLD:
                 continue
             x1, y1, x2, y2 = self.bbox
             ox1, oy1, ox2, oy2 = unit.bbox
             
             # Verifica se c'è collisione con una tolleranza di sovrapposizione
-            if not (x1 < ox2 - OVERLAP_TOLERANCE and
-                    x2 > ox1 + OVERLAP_TOLERANCE and
-                    y1 < oy2 - OVERLAP_TOLERANCE and
-                    y2 > oy1 + OVERLAP_TOLERANCE):
-                continue
-            if self.id in self.game.units and unit.id in self.game.units:
-                if self.sex == unit.sex and self.fight:
-                    self.die(unit)
-                elif self.sex != unit.sex:
-                    if "fuck" in dir(self):
-                        self.fuck(unit)
+            if (x1 < ox2 - OVERLAP_TOLERANCE and
+                x2 > ox1 + OVERLAP_TOLERANCE and
+                y1 < oy2 - OVERLAP_TOLERANCE and
+                y2 > oy1 + OVERLAP_TOLERANCE):
+                if self.id in self.game.units and unit.id in self.game.units:
+                    if self.sex == unit.sex and self.fight:
+                        self.die(unit)
+                    elif self.sex != unit.sex:
+                        if "fuck" in dir(self):
+                            self.fuck(unit)
                     
     def die(self, unit=None):
         if not unit: