diff --git a/OSM_Regions/RegionLoader.cs b/OSM_Regions/RegionLoader.cs
index c07c8fe..b34a554 100644
--- a/OSM_Regions/RegionLoader.cs
+++ b/OSM_Regions/RegionLoader.cs
@@ -12,6 +12,7 @@ public class RegionLoader(float regionSize, string? importFolderPath = null, ILo
     internal readonly string ImportFolderPath = Path.Join(importFolderPath ?? Environment.CurrentDirectory, regionSize.ToString(CultureInfo.InvariantCulture));
     private const string NodesMapRegionFileName = "nodes.map";
     private const string WayMapRegionFileName = "ways.map";
+    private Dictionary<ulong, long>? nodeRegionDict = null;
 
     public Graph.Graph? LoadRegionFromRegionId(long regionId)
     {
@@ -81,24 +82,30 @@ public class RegionLoader(float regionSize, string? importFolderPath = null, ILo
     public Graph.Graph? LoadRegionFromNodeId(ulong nodeId)
     {
         logger?.LogDebug($"Loading Region for Node {nodeId}");
-        using StreamReader nodesMapFileStream = new(Path.Join(ImportFolderPath, NodesMapRegionFileName), Encoding.ASCII); 
-        while (!nodesMapFileStream.EndOfStream)
+        if (nodeRegionDict is null)
         {
-            string? line = nodesMapFileStream.ReadLine();
-            if(line is null)
-                continue;
-            try
+            nodeRegionDict = new();
+            using StreamReader nodesMapFileStream = new(Path.Join(ImportFolderPath, NodesMapRegionFileName), Encoding.ASCII); 
+            while (!nodesMapFileStream.EndOfStream)
             {
-                ulong id = ulong.Parse(line.Split('-')[0]);
-                if (id == nodeId)
-                    return LoadRegionFromRegionId(long.Parse(line.Split('-')[1]));
-            }
-            catch (Exception e)
-            {
-                logger?.LogError(e, "Error parsing Node-line.");
+                string? line = nodesMapFileStream.ReadLine();
+                if(line is null)
+                    continue;
+                try
+                {
+                    ulong id = ulong.Parse(line.Split('-')[0]);
+                    long regionId = long.Parse(line.Split('-')[1]);
+                    nodeRegionDict.TryAdd(id, regionId);
+                }
+                catch (Exception e)
+                {
+                    logger?.LogError(e, "Error parsing Node-line.");
+                }
             }
         }
-        
+
+        if (!nodeRegionDict.TryGetValue(nodeId, out long rId))
+            return LoadRegionFromRegionId(rId);
         logger?.LogWarning($"Could not find Node {nodeId}");
         return null;
     }