diff --git a/Subsurface/Source/Networking/GameServer.cs b/Subsurface/Source/Networking/GameServer.cs
index f36f48148..4b0669d40 100644
--- a/Subsurface/Source/Networking/GameServer.cs
+++ b/Subsurface/Source/Networking/GameServer.cs
@@ -1471,7 +1471,7 @@ namespace Barotrauma.Networking
             }
            
             float similarity = 0;
-            similarity += sender.ChatSpamSpeed; //the faster messages are being sent, the faster the filter will block
+            similarity += sender.ChatSpamSpeed * 0.05f; //the faster messages are being sent, the faster the filter will block
             for (int i = 0; i < sender.ChatMessages.Count; i++)
             {
                 float closeFactor = 1.0f / (20.0f - i);
diff --git a/Subsurface/Source/Utils/ToolBox.cs b/Subsurface/Source/Utils/ToolBox.cs
index c13b97ad3..3370e8e84 100644
--- a/Subsurface/Source/Utils/ToolBox.cs
+++ b/Subsurface/Source/Utils/ToolBox.cs
@@ -365,6 +365,35 @@ namespace Barotrauma
 
             return inputType;
         }
+
+        /// <summary>
+        /// Calculates the minimum number of single-character edits (i.e. insertions, deletions or substitutions) required to change one string into the other
+        /// </summary>
+        public static int LevenshteinDistance(string s, string t)
+        {
+            int n = s.Length;
+            int m = t.Length;
+            int[,] d = new int[n + 1, m + 1];
+
+            if (n == 0 || m == 0) return 0;
+
+            for (int i = 0; i <= n; d[i, 0] = i++);
+            for (int j = 0; j <= m; d[0, j] = j++);
+
+            for (int i = 1; i <= n; i++)
+            {
+                for (int j = 1; j <= m; j++)
+                {
+                    int cost = (t[j - 1] == s[i - 1]) ? 0 : 1;
+
+                    d[i, j] = Math.Min(
+                        Math.Min(d[i - 1, j] + 1, d[i, j - 1] + 1),
+                        d[i - 1, j - 1] + cost);
+                }
+            }
+            
+            return d[n, m];
+        }
         
         public static string WrapText(string text, float lineLength, SpriteFont font)
         {