diff --git a/qt_ui/main.py b/qt_ui/main.py
index 0a4173c5..5bbbebef 100644
--- a/qt_ui/main.py
+++ b/qt_ui/main.py
@@ -58,7 +58,7 @@ def inject_custom_payloads(user_path: Path) -> None:
     PayloadDirectories.set_preferred(user_path / "MissionEditor" / "UnitPayloads")
 
 
-def run_ui(game: Optional[Game], new_map: bool) -> None:
+def run_ui(game: Optional[Game], new_map: bool, dev: bool) -> None:
     os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"  # Potential fix for 4K screens
     app = QApplication(sys.argv)
 
@@ -92,8 +92,10 @@ def run_ui(game: Optional[Game], new_map: bool) -> None:
     splash = QSplashScreen(pixmap)
     splash.show()
 
-    # Give enough time to read splash screen
-    time.sleep(3)
+    # Developers are launching the game in a loop hundreds of times. We've read it.
+    if not dev:
+        # Give enough time to read splash screen
+        time.sleep(3)
 
     # Once splash screen is up : load resources & setup stuff
     uiconstants.load_icons()
@@ -172,16 +174,18 @@ def parse_args() -> argparse.Namespace:
         help="Emits a warning for weapons without date or fallback information.",
     )
 
+    parser.add_argument("--dev", action="store_true", help="Enable development mode.")
+
     parser.add_argument(
         "--new-map",
         action="store_true",
-        help="Use the Vue based map. Not yet fully functional.",
+        help="Use the React based map. Not yet fully functional.",
     )
     parser.add_argument(
         "--old-map",
         dest="new_map",
         action="store_false",
-        help="Deprecated. Does nothing.",
+        help="Use the legacy map. This is the default.",
     )
 
     new_game = subparsers.add_parser("new-game")
@@ -352,7 +356,7 @@ def main():
         return
 
     with Server().run_in_thread():
-        run_ui(game, args.new_map)
+        run_ui(game, args.new_map, args.dev)
 
 
 if __name__ == "__main__":