diff --git a/extensions/default/src/DicomLocalDataSource/index.js b/extensions/default/src/DicomLocalDataSource/index.js
index d049b404a..462fb8751 100644
--- a/extensions/default/src/DicomLocalDataSource/index.js
+++ b/extensions/default/src/DicomLocalDataSource/index.js
@@ -142,7 +142,9 @@ function createDicomLocalApi(dicomLocalConfig) {
           study.series.forEach(aSeries => {
             const { SeriesInstanceUID } = aSeries;
 
-            aSeries.instances.forEach(instance => {
+            const isMultiframe = aSeries.instances[0].NumberOfFrames > 1;
+
+            aSeries.instances.forEach((instance, index) => {
               const {
                 url: imageId,
                 StudyInstanceUID,
@@ -151,22 +153,14 @@ function createDicomLocalApi(dicomLocalConfig) {
               } = instance;
 
               instance.imageId = imageId;
-              const numberOfFrames = instance.NumberOfFrames || 1;
-              // Process all frames consistently, whether single or multiframe
-              for (let i = 0; i < numberOfFrames; i++) {
-                const frameNumber = i + 1;
-                const frameImageId = implementation.getImageIdsForInstance({
-                  instance,
-                  frame: frameNumber,
-                });
-                // Add imageId specific mapping to this data as the URL isn't necessarily WADO-URI.
-                metadataProvider.addImageIdToUIDs(frameImageId, {
-                  StudyInstanceUID,
-                  SeriesInstanceUID,
-                  SOPInstanceUID,
-                  frameNumber: numberOfFrames > 1 ? frameNumber : undefined,
-                });
-              }
+
+              // Add imageId specific mapping to this data as the URL isn't necessarily WADO-URI.
+              metadataProvider.addImageIdToUIDs(imageId, {
+                StudyInstanceUID,
+                SeriesInstanceUID,
+                SOPInstanceUID,
+                frameIndex: isMultiframe ? index : 1,
+              });
             });
 
             DicomMetadataStore._broadcastEvent(EVENTS.INSTANCES_ADDED, {
diff --git a/extensions/default/src/DicomWebDataSource/index.ts b/extensions/default/src/DicomWebDataSource/index.ts
index 6bf6c4e12..7d9cde6d3 100644
--- a/extensions/default/src/DicomWebDataSource/index.ts
+++ b/extensions/default/src/DicomWebDataSource/index.ts
@@ -478,7 +478,6 @@ function createDicomWebApi(dicomWebConfig: DicomWebConfig, servicesManager) {
           instance.wadoUri = dicomWebConfig.wadoUri;
 
           const { StudyInstanceUID, SeriesInstanceUID, SOPInstanceUID } = instance;
-
           const numberOfFrames = instance.NumberOfFrames || 1;
           // Process all frames consistently, whether single or multiframe
           for (let i = 0; i < numberOfFrames; i++) {
diff --git a/platform/app/public/config/local_orthanc.js b/platform/app/public/config/local_orthanc.js
index 0a6fbafce..b17dc3fbe 100644
--- a/platform/app/public/config/local_orthanc.js
+++ b/platform/app/public/config/local_orthanc.js
@@ -8,7 +8,7 @@ window.config = {
   showLoadingIndicator: true,
   showWarningMessageForCrossOrigin: true,
   showCPUFallbackMessage: true,
-  strictZSpacingForVolumeViewport: false,
+  strictZSpacingForVolumeViewport: true,
   // filterQueryParam: false,
   defaultDataSourceName: 'orthanc',
   dataSources: [
diff --git a/platform/core/src/classes/MetadataProvider.ts b/platform/core/src/classes/MetadataProvider.ts
index 87a2d9396..3fccff5e6 100644
--- a/platform/core/src/classes/MetadataProvider.ts
+++ b/platform/core/src/classes/MetadataProvider.ts
@@ -9,7 +9,6 @@ import combineFrameInstance from '../utils/combineFrameInstance';
 
 class MetadataProvider {
   private readonly imageURIToUIDs: Map<string, any> = new Map();
-  private readonly imageUIDsByImageId: Map<string, any> = new Map();
   // Can be used to store custom metadata for a specific type.
   // For instance, the scaling metadata for PET can be stored here
   // as type "scalingModule"
@@ -25,7 +24,6 @@ class MetadataProvider {
     // An example would be dicom hosted at some random site.
     const imageURI = imageIdToURI(imageId);
     this.imageURIToUIDs.set(imageURI, uids);
-    this.imageUIDsByImageId.set(imageId, uids);
   }
 
   addCustomMetadata(imageId, type, metadata) {
@@ -462,11 +460,6 @@ class MetadataProvider {
   }
 
   getUIDsFromImageID(imageId) {
-    const cachedUIDs = this.imageUIDsByImageId.get(imageId);
-    if (cachedUIDs) {
-      return cachedUIDs;
-    }
-
     if (imageId.startsWith('wadors:')) {
       const strippedImageId = imageId.split('/studies/')[1];
       const splitImageId = strippedImageId.split('/');
diff --git a/platform/core/src/utils/combineFrameInstance.ts b/platform/core/src/utils/combineFrameInstance.ts
index ee3aeaa99..4202c5b0f 100644
--- a/platform/core/src/utils/combineFrameInstance.ts
+++ b/platform/core/src/utils/combineFrameInstance.ts
@@ -67,18 +67,27 @@ const combineFrameInstance = (frame, instance) => {
         ImagePositionPatientToUse = [position[0], position[1], position[2]];
       }
     }
-    const sharedInstance = createCombinedValue(instance, SharedFunctionalGroupsSequence?.[0]);
+
+    // Cache the _parentInstance at the top level as a full copy to prevent
+    // setting values hard.
+    if (!instance._parentInstance) {
+      Object.defineProperty(instance, '_parentInstance', {
+        value: { ...instance },
+      });
+    }
+    const sharedInstance = createCombinedValue(
+      instance._parentInstance,
+      SharedFunctionalGroupsSequence?.[0],
+      '_shared'
+    );
     const newInstance = createCombinedValue(
       sharedInstance,
-      PerFrameFunctionalGroupsSequence?.[frameNumber]
+      PerFrameFunctionalGroupsSequence?.[frameNumber - 1],
+      frameNumber
     );
 
-    Object.defineProperty(newInstance, 'ImagePositionPatient', {
-      value: ImagePositionPatientToUse ?? newInstance.ImagePositionPatient ?? [0, 0, frameNumber],
-      writable: true,
-      enumerable: true,
-      configurable: true,
-    });
+    newInstance.ImagePositionPatient = ImagePositionPatientToUse ??
+      newInstance.ImagePositionPatient ?? [0, 0, frameNumber];
 
     Object.defineProperty(newInstance, 'frameNumber', {
       value: frameNumber,
@@ -92,14 +101,25 @@ const combineFrameInstance = (frame, instance) => {
   }
 };
 
-function createCombinedValue(parent, functionalGroups) {
+/**
+ * Creates a combined instance stored in the parent object which
+ * inherits from the parent instance the attributes in the functional groups.
+ * The storage key in the parent is in key
+ */
+function createCombinedValue(parent, functionalGroups, key) {
+  if (parent[key]) {
+    return parent[key];
+  }
+  // Exclude any proxying values
   const newInstance = Object.create(parent);
+  Object.defineProperty(parent, key, {
+    value: newInstance,
+    writable: false,
+    enumerable: false,
+  });
   if (!functionalGroups) {
     return newInstance;
   }
-  if (functionalGroups._sharedValue) {
-    return functionalGroups._sharedValue;
-  }
   const shared = functionalGroups
     ? Object.values(functionalGroups)
         .filter(Boolean)
@@ -117,11 +137,6 @@ function createCombinedValue(parent, functionalGroups) {
       newInstance[key] = value;
     });
   });
-  Object.defineProperty(functionalGroups, '_sharedValue', {
-    value: newInstance,
-    writable: false,
-    enumerable: false,
-  });
   return newInstance;
 }