diff --git a/src/DotRecast.Detour.TileCache/DtTileCache.cs b/src/DotRecast.Detour.TileCache/DtTileCache.cs
index 11abac4..5262231 100644
--- a/src/DotRecast.Detour.TileCache/DtTileCache.cs
+++ b/src/DotRecast.Detour.TileCache/DtTileCache.cs
@@ -22,16 +22,15 @@ using System;
 using System.Collections.Generic;
 using DotRecast.Core;
 using DotRecast.Detour.TileCache.Io;
-using static DotRecast.Core.RcMath;
 
 namespace DotRecast.Detour.TileCache
 {
     public class DtTileCache
     {
-        int m_tileLutSize;
+        private int m_tileLutSize;
 
         /// < Tile hash lookup size (must be pot).
-        int m_tileLutMask;
+        private int m_tileLutMask;
 
         /// < Tile hash lookup mask.
         private readonly DtCompressedTile[] m_posLookup;
@@ -719,9 +718,9 @@ namespace DotRecast.Detour.TileCache
             }
         }
 
-        public DtTileCacheParams GetParams()
+        public ref readonly DtTileCacheParams GetParams()
         {
-            return m_params;
+            return ref m_params;
         }
 
         public IRcCompressor GetCompressor()
diff --git a/src/DotRecast.Detour.TileCache/DtTileCacheParams.cs b/src/DotRecast.Detour.TileCache/DtTileCacheParams.cs
index 53d79e8..fc66edf 100644
--- a/src/DotRecast.Detour.TileCache/DtTileCacheParams.cs
+++ b/src/DotRecast.Detour.TileCache/DtTileCacheParams.cs
@@ -22,9 +22,9 @@ using DotRecast.Core;
 
 namespace DotRecast.Detour.TileCache
 {
-    public class DtTileCacheParams
+    public struct DtTileCacheParams
     {
-        public RcVec3f orig = new RcVec3f();
+        public RcVec3f orig;
         public float cs, ch;
         public int width, height;
         public float walkableHeight;
diff --git a/src/DotRecast.Detour.TileCache/Io/DtTileCacheSetHeader.cs b/src/DotRecast.Detour.TileCache/Io/DtTileCacheSetHeader.cs
index c1ecc9a..85f31b6 100644
--- a/src/DotRecast.Detour.TileCache/Io/DtTileCacheSetHeader.cs
+++ b/src/DotRecast.Detour.TileCache/Io/DtTileCacheSetHeader.cs
@@ -20,7 +20,7 @@ freely, subject to the following restrictions:
 
 namespace DotRecast.Detour.TileCache.Io
 {
-    public class DtTileCacheSetHeader
+    public struct DtTileCacheSetHeader
     {
         public const int TILECACHESET_MAGIC = 'T' << 24 | 'S' << 16 | 'E' << 8 | 'T'; // 'TSET';
         public const int TILECACHESET_VERSION = 1;
@@ -29,7 +29,7 @@ namespace DotRecast.Detour.TileCache.Io
         public int magic;
         public int version;
         public int numTiles;
-        public DtNavMeshParams meshParams = new DtNavMeshParams();
-        public DtTileCacheParams cacheParams = new DtTileCacheParams();
+        public DtNavMeshParams meshParams;
+        public DtTileCacheParams cacheParams;
     }
 }
\ No newline at end of file
diff --git a/src/DotRecast.Detour/DtNavMesh.cs b/src/DotRecast.Detour/DtNavMesh.cs
index 0a3365a..a48bd01 100644
--- a/src/DotRecast.Detour/DtNavMesh.cs
+++ b/src/DotRecast.Detour/DtNavMesh.cs
@@ -324,9 +324,9 @@ namespace DotRecast.Detour
             return true;
         }
 
-        public DtNavMeshParams GetParams()
+        public ref readonly DtNavMeshParams GetParams()
         {
-            return m_params;
+            return ref m_params;
         }
 
 
diff --git a/src/DotRecast.Detour/DtNavMeshParams.cs b/src/DotRecast.Detour/DtNavMeshParams.cs
index 414100e..ddaba1d 100644
--- a/src/DotRecast.Detour/DtNavMeshParams.cs
+++ b/src/DotRecast.Detour/DtNavMeshParams.cs
@@ -28,10 +28,10 @@ namespace DotRecast.Detour
  *
  * @see NavMesh
  */
-    public class DtNavMeshParams
+    public struct DtNavMeshParams
     {
         /** The world space origin of the navigation mesh's tile space. [(x, y, z)] */
-        public RcVec3f orig = new RcVec3f();
+        public RcVec3f orig;
 
         /** The width of each tile. (Along the x-axis.) */
         public float tileWidth;