Fix scroll speed

extensions/cornerstone/src/OHIFCornerstoneViewport.js

@@ -179,7 +179,7 @@ class OHIFCornerstoneViewport extends Component {
 
     if (
       displaySet.displaySetInstanceUID !==
-      prevDisplaySet.displaySetInstanceUID ||
+        prevDisplaySet.displaySetInstanceUID ||
       displaySet.SOPInstanceUID !== prevDisplaySet.SOPInstanceUID ||
       displaySet.frameIndex !== prevDisplaySet.frameIndex
     ) {
@@ -235,8 +235,8 @@ class OHIFCornerstoneViewport extends Component {
           viewportIndex={viewportIndex}
           imageIds={imageIds}
           imageIdIndex={currentImageIdIndex}
-          onNewImage={newImageHandler}
-          onNewImageDebounceTime={700}
+          onNewImageDebounced={newImageHandler}
+          onNewImageDebounceTime={300}
           // ~~ Connected (From REDUX)
           // frameRate={frameRate}
           // isPlaying={false}

extensions/cornerstone/src/commandsModule.js

@@ -268,6 +268,7 @@ const commandsModule = ({ servicesManager }) => {
       SOPInstanceUID,
       frameIndex,
       activeViewportIndex,
+      refreshViewports = true,
     }) => {
       const study = studyMetadataManager.get(StudyInstanceUID);
 
@@ -278,6 +279,10 @@ const commandsModule = ({ servicesManager }) => {
         );
       });
 
+      if (!displaySet) {
+        return;
+      }
+
       displaySet.SOPInstanceUID = SOPInstanceUID;
       displaySet.frameIndex = frameIndex;
 
@@ -285,7 +290,9 @@ const commandsModule = ({ servicesManager }) => {
         setViewportSpecificData(activeViewportIndex, displaySet)
       );
 
-      refreshCornerstoneViewports();
+      if (refreshViewports) {
+        refreshCornerstoneViewports();
+      }
     },
   };
 

extensions/cornerstone/src/index.js

@@ -38,7 +38,14 @@ export default {
   },
   getViewportModule({ commandsManager }) {
     const ExtendedOHIFCornerstoneViewport = props => {
+      /**
+       * TODO: This appears to be used to set the redux parameters for
+       * the viewport when new images are loaded. It's very ugly
+       * and we should remove it.
+       */
       const onNewImageHandler = jumpData => {
+        /** Do not trigger all viewports to render unnecessarily */
+        jumpData.refreshViewports = false;
         commandsManager.runCommand('jumpToImage', jumpData);
       };
       return (