diff --git a/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs b/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs
index 29e3dee16..79f7d94c1 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using UniGLTF.Utils;
 using UnityEngine;
 
@@ -249,5 +250,33 @@ namespace UniGLTF
                 UnityObjectDestroyer.DestroyRuntimeOrEditor(this.gameObject);
             }
         }
+
+        static Dictionary<Transform, IReadOnlyDictionary<Transform, TransformState>> PoseMap = new();
+        public static IReadOnlyDictionary<Transform, TransformState> SafeGetInitialPose(
+            Transform root, bool useCache = true)
+        {
+            if (useCache && PoseMap.TryGetValue(root, out var pose))
+            {
+                return pose;
+            }
+
+            if (root.TryGetComponent<RuntimeGltfInstance>(out var runtime))
+            {
+                // RuntimeGltfInstance があるとき => RuntimeLoad => 初期姿勢は glTF の node に由来する                
+                // copy
+                pose = runtime.InitialTransformStates.ToDictionary((kv) => kv.Key, (kv) => kv.Value);
+            }
+            else
+            {
+                // RuntimeGltfInstance が無いとき => Scene 配置の prefab など。シーンの現状を代用する。
+                // T-Pose であることを期待しているが既に T-Pose でないかもしれない。
+                pose = root.GetComponentsInChildren<Transform>().ToDictionary(x => x, x => new TransformState(x));
+            }
+
+            // add cache
+            PoseMap.Add(root, pose);
+
+            return pose;
+        }
     }
 }
diff --git a/Assets/VRM/Runtime/SpringBone/Jobs/FastSpringBoneReplacer.cs b/Assets/VRM/Runtime/SpringBone/Jobs/FastSpringBoneReplacer.cs
index 71c5d39f1..58d6192b6 100644
--- a/Assets/VRM/Runtime/SpringBone/Jobs/FastSpringBoneReplacer.cs
+++ b/Assets/VRM/Runtime/SpringBone/Jobs/FastSpringBoneReplacer.cs
@@ -53,8 +53,7 @@ namespace VRM.SpringBoneJobs
                     }
                 }
 
-                var runtime = root.GetComponent<RuntimeGltfInstance>();
-                var initMap = runtime != null ? runtime.InitialTransformStates : root.GetComponentsInChildren<Transform>().ToDictionary(x => x, x => new TransformState(x));
+                var initMap = RuntimeGltfInstance.SafeGetInitialPose(root.transform);
 
                 var joints = new List<FastSpringBoneJoint>();
                 foreach (var springRoot in component.RootBones)
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
index c8cacae73..f27be9aea 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
@@ -140,15 +140,7 @@ namespace UniVRM10
                 // importer 内で InitializeAsync が呼び出し済み
             }
 
-            var runtime = GetComponent<RuntimeGltfInstance>();
-
-            // Vrm10Runtimeが使う初期姿勢を固定する。SpringBone や Constraint の初期姿勢になる。
-            var initPose = runtime != null
-            // RuntimeGltfInstance があるとき => RuntimeLoad => 初期姿勢は glTF の node に由来する
-            ? runtime.InitialTransformStates.ToDictionary((kv) => kv.Key, (kv) => kv.Value)
-            // RuntimeGltfInstance が無いとき => Scene 配置の prefab など。シーンの現状を代用する。既に T-Pose でないかもしれない。
-            : GetComponentsInChildren<Transform>().ToDictionary(x => x, x => new TransformState(x))
-            ;
+            var initPose = RuntimeGltfInstance.SafeGetInitialPose(transform);
 
             return new Vrm10Runtime(this, useControlRig, m_springBoneRuntime, initPose);
         }
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs
index e7a7750af..6dc1761e0 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs
@@ -101,11 +101,11 @@ namespace UniVRM10
         public void RestoreInitialTransform()
         {
             // Spring の joint に対応する transform の回転を初期状態
-            var instance = m_instance.GetComponent<RuntimeGltfInstance>();
+            var pose = RuntimeGltfInstance.SafeGetInitialPose(m_instance.transform);
             foreach (var logic in m_fastSpringBoneBuffer.Logics)
             {
                 var transform = m_fastSpringBoneBuffer.Transforms[logic.headTransformIndex];
-                transform.localRotation = instance.InitialTransformStates[transform].LocalRotation;
+                transform.localRotation = pose[transform].LocalRotation;
             }
 
             // jobs のバッファにも反映する必要あり
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs
index caf09e2ba..12e151e07 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs
@@ -107,11 +107,11 @@ namespace UniVRM10
         public void RestoreInitialTransform()
         {
             // Spring の joint に対応する transform の回転を初期状態
-            var instance = m_instance.GetComponent<RuntimeGltfInstance>();
+            var pose = RuntimeGltfInstance.SafeGetInitialPose(m_instance.transform);
             foreach (var logic in m_fastSpringBoneBuffer.Logics)
             {
                 var transform = m_fastSpringBoneBuffer.Transforms[logic.headTransformIndex];
-                transform.localRotation = instance.InitialTransformStates[transform].LocalRotation;
+                transform.localRotation = pose[transform].LocalRotation;
             }
 
             // jobs のバッファにも反映する必要あり