diff --git a/Assets/Mirror/Core/NetworkClient.cs b/Assets/Mirror/Core/NetworkClient.cs
index 1584cb693..2813d22c8 100644
--- a/Assets/Mirror/Core/NetworkClient.cs
+++ b/Assets/Mirror/Core/NetworkClient.cs
@@ -1639,5 +1639,28 @@ public static void Shutdown()
             OnDisconnectedEvent = null;
             OnErrorEvent = null;
         }
+        // GUI /////////////////////////////////////////////////////////////////
+        // called from NetworkManager to display timeline interpolation status.
+        // useful to indicate catchup / slowdown / dynamic adjustment etc.
+        internal static void OnGUI()
+        {
+            // only if in world
+            if (!ready) return;
+
+            GUILayout.BeginArea(new Rect(10, 5, 400, 50));
+
+            GUILayout.BeginHorizontal("Box");
+            GUILayout.Label("Snapshot Interp.:");
+            // color while catching up / slowing down
+            if      (localTimescale > 1) GUI.color = Color.green; // green traffic light = go fast
+            else if (localTimescale < 1) GUI.color = Color.red;   // red traffic light = go slow
+            else                         GUI.color = Color.white;
+            GUILayout.Box($"timeline: {localTimeline:F2}");
+            GUILayout.Box($"buffer: {snapshots.Count}");
+            GUILayout.Box($"timescale: {localTimescale:F2}");
+            GUILayout.EndHorizontal();
+
+            GUILayout.EndArea();
+        }
     }
 }
diff --git a/Assets/Mirror/Core/NetworkManager.cs b/Assets/Mirror/Core/NetworkManager.cs
index d1fb89e99..30fbea40e 100644
--- a/Assets/Mirror/Core/NetworkManager.cs
+++ b/Assets/Mirror/Core/NetworkManager.cs
@@ -105,6 +105,9 @@ public class NetworkManager : MonoBehaviour
         public static List<Transform> startPositions = new List<Transform>();
         public static int startPositionIndex;
 
+        [Header("Debug")]
+        public bool timeInterpolationGui = false;
+
         /// <summary>The one and only NetworkManager</summary>
         public static NetworkManager singleton { get; internal set; }
 
@@ -1342,5 +1345,12 @@ public virtual void OnStopClient() {}
 
         /// <summary>This is called when a host is stopped.</summary>
         public virtual void OnStopHost() {}
+
+        // GUI /////////////////////////////////////////////////////////////////
+        void OnGUI()
+        {
+            if (!timeInterpolationGui) return;
+            NetworkClient.OnGUI();
+        }
     }
 }