diff --git a/src/vocalinux/text_injection/text_injector.py b/src/vocalinux/text_injection/text_injector.py
index 16d04af..11f2abf 100644
--- a/src/vocalinux/text_injection/text_injector.py
+++ b/src/vocalinux/text_injection/text_injector.py
@@ -987,7 +987,13 @@ class TextInjector:
         if self.wayland_tool == "wtype":
             cmd = ["wtype", text]
         else:  # ydotool
-            cmd = ["ydotool", "type", text]
+            # Pass explicit timing parameters to speed up injection.
+            # ydotool defaults to --key-delay 12 (or 20 in older versions).
+            # We use a faster default configurable via environment variable.
+            # IMPORTANT: key-delay must stay > 0 to avoid Shift-leak bug where
+            # capital letters corrupt following characters (e.g. "Can you" -> "CAN YOu").
+            key_delay = os.environ.get("VOCALINUX_YDOTOOL_KEY_DELAY", "8")
+            cmd = ["ydotool", "type", "--key-delay", key_delay, text]
 
         try:
             subprocess.run(cmd, check=True, stderr=subprocess.PIPE, text=True)
diff --git a/tests/test_text_injector.py b/tests/test_text_injector.py
index c52f917..b68297e 100644
--- a/tests/test_text_injector.py
+++ b/tests/test_text_injector.py
@@ -205,9 +205,9 @@ class TestTextInjector(unittest.TestCase):
             # Inject text
             injector.inject_text("Hello world")
 
-            # Verify ydotool was called correctly
+            # Verify ydotool was called correctly with timing parameters
             self.mock_subprocess.assert_any_call(
-                ["ydotool", "type", "Hello world"],
+                ["ydotool", "type", "--key-delay", "8", "Hello world"],
                 check=True,
                 stderr=subprocess.PIPE,
                 text=True,