diff --git a/cromulant/config.py b/cromulant/config.py
index bb7d00f..3085e43 100644
--- a/cromulant/config.py
+++ b/cromulant/config.py
@@ -52,6 +52,7 @@ class Config:
     settings_json: Path
     countries_json: Path
     filter_width: int = 150
+    filter_debouncer_delay: int = 200
 
     @staticmethod
     def prepare() -> None:
diff --git a/cromulant/filter.py b/cromulant/filter.py
index 209ed60..3c55a96 100644
--- a/cromulant/filter.py
+++ b/cromulant/filter.py
@@ -2,17 +2,33 @@ from __future__ import annotations
 
 from PySide6.QtWidgets import QWidget  # type: ignore
 from PySide6.QtGui import QKeyEvent  # type: ignore
+from PySide6.QtCore import QTimer
 
+from .config import Config
 from .window import Window
 
 
 class Filter:
+    debouncer: QTimer
+
+    @staticmethod
+    def prepare() -> None:
+        Filter.debouncer = QTimer()
+        Filter.debouncer.setSingleShot(True)
+        Filter.debouncer.setInterval(Config.filter_debouncer_delay)
+        Filter.debouncer.timeout.connect(Filter.do_filter)
+
     @staticmethod
     def get_value() -> str:
         return str(Window.filter.text()).lower().strip()
 
     @staticmethod
     def filter(event: QKeyEvent | None = None) -> None:
+        Filter.debouncer.stop()
+        Filter.debouncer.start()
+
+    @staticmethod
+    def do_filter() -> None:
         value = Filter.get_value()
 
         for i in range(Window.view.count()):
diff --git a/cromulant/game.py b/cromulant/game.py
index e4a66c5..a05ffc5 100644
--- a/cromulant/game.py
+++ b/cromulant/game.py
@@ -273,7 +273,7 @@ class Game:
 
     @staticmethod
     def restart() -> None:
-        opts = ["25", "50", "100", "200", "300", "400", "500"]
+        opts = ["25", "50", "100", "200", "300"]
         opts = [f"{opt} ants" for opt in opts]
         size = Window.prompt_combobox("Size of the population", opts, 2)
 
diff --git a/cromulant/main.py b/cromulant/main.py
index 3c77a84..70250d9 100644
--- a/cromulant/main.py
+++ b/cromulant/main.py
@@ -6,6 +6,7 @@ from .ants import Ants
 from .window import Window
 from .game import Game
 from .settings import Settings
+from .filter import Filter
 
 
 def main() -> None:
@@ -14,6 +15,7 @@ def main() -> None:
     Window.prepare()
     Ants.prepare()
     Settings.prepare()
+    Filter.prepare()
     Game.prepare()
     Game.start_loop()
     Window.start()