diff --git a/core/java/com/android/internal/app/ShutdownThread.java b/core/java/com/android/internal/app/ShutdownThread.java
index 01f6dac..2060cf8 100644
--- a/core/java/com/android/internal/app/ShutdownThread.java
+++ b/core/java/com/android/internal/app/ShutdownThread.java
@@ -32,6 +32,7 @@
 import android.os.Power;
 import android.os.ServiceManager;
 import android.os.SystemClock;
+
 import com.android.internal.telephony.ITelephony;
 import android.util.Log;
 import android.view.WindowManager;
@@ -91,7 +92,10 @@
                     .setNegativeButton(com.android.internal.R.string.no, null)
                     .create();
             dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
-            dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
+            if (!context.getResources().getBoolean(
+                    com.android.internal.R.bool.config_sf_slowBlur)) {
+                dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
+            }
             dialog.show();
         } else {
             beginShutdownSequence(context);
@@ -111,7 +115,10 @@
         pd.setIndeterminate(true);
         pd.setCancelable(false);
         pd.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
-        pd.getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
+        if (!context.getResources().getBoolean(
+                com.android.internal.R.bool.config_sf_slowBlur)) {
+            pd.getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
+        }
 
         pd.show();