diff --git a/apps/openmw/mwrender/renderingmanager.cpp b/apps/openmw/mwrender/renderingmanager.cpp
index be3caaeb4..177cee4ea 100644
--- a/apps/openmw/mwrender/renderingmanager.cpp
+++ b/apps/openmw/mwrender/renderingmanager.cpp
@@ -258,16 +258,21 @@ namespace MWRender
         return mResourceSystem;
     }
 
-    SceneUtil::WorkQueue *RenderingManager::getWorkQueue()
+    SceneUtil::WorkQueue* RenderingManager::getWorkQueue()
     {
         return mWorkQueue.get();
     }
 
-    SceneUtil::UnrefQueue *RenderingManager::getUnrefQueue()
+    SceneUtil::UnrefQueue* RenderingManager::getUnrefQueue()
     {
         return mUnrefQueue.get();
     }
 
+    Terrain::World* RenderingManager::getTerrain()
+    {
+        return mTerrain.get();
+    }
+
     void RenderingManager::preloadCommonAssets()
     {
         osg::ref_ptr<PreloadCommonAssetsWorkItem> workItem (new PreloadCommonAssetsWorkItem(mResourceSystem));
@@ -279,12 +284,6 @@ namespace MWRender
         mWorkQueue->addWorkItem(workItem);
     }
 
-    void RenderingManager::clearCache()
-    {
-        if (mTerrain.get())
-            mTerrain->clearCache();
-    }
-
     double RenderingManager::getReferenceTime() const
     {
         return mViewer->getFrameStamp()->getReferenceTime();
@@ -838,7 +837,7 @@ namespace MWRender
     void RenderingManager::updateTextureFiltering()
     {
         if (mTerrain.get())
-            mTerrain->clearCache();
+            mTerrain->updateCache();
 
         mResourceSystem->getSceneManager()->setFilterSettings(
             Settings::Manager::getString("texture mag filter", "General"),
diff --git a/apps/openmw/mwrender/renderingmanager.hpp b/apps/openmw/mwrender/renderingmanager.hpp
index 4c850de12..4dda6f273 100644
--- a/apps/openmw/mwrender/renderingmanager.hpp
+++ b/apps/openmw/mwrender/renderingmanager.hpp
@@ -73,11 +73,10 @@ namespace MWRender
 
         SceneUtil::WorkQueue* getWorkQueue();
         SceneUtil::UnrefQueue* getUnrefQueue();
+        Terrain::World* getTerrain();
 
         void preloadCommonAssets();
 
-        void clearCache();
-
         double getReferenceTime() const;
 
         osg::Group* getLightRoot();
diff --git a/apps/openmw/mwworld/cellpreloader.cpp b/apps/openmw/mwworld/cellpreloader.cpp
index 047c1e99b..e72c36c68 100644
--- a/apps/openmw/mwworld/cellpreloader.cpp
+++ b/apps/openmw/mwworld/cellpreloader.cpp
@@ -8,6 +8,7 @@
 #include <components/resource/keyframemanager.hpp>
 #include <components/misc/resourcehelpers.hpp>
 #include <components/nifosg/nifloader.hpp>
+#include <components/terrain/world.hpp>
 
 #include "../mwbase/environment.hpp"
 #include "../mwbase/world.hpp"
@@ -44,10 +45,14 @@ namespace MWWorld
     {
     public:
         /// Constructor to be called from the main thread.
-        PreloadItem(MWWorld::CellStore* cell, Resource::SceneManager* sceneManager, Resource::BulletShapeManager* bulletShapeManager, Resource::KeyframeManager* keyframeManager)
-            : mSceneManager(sceneManager)
+        PreloadItem(MWWorld::CellStore* cell, Resource::SceneManager* sceneManager, Resource::BulletShapeManager* bulletShapeManager, Resource::KeyframeManager* keyframeManager, Terrain::World* terrain)
+            : mIsExterior(cell->getCell()->isExterior())
+            , mX(cell->getCell()->getGridX())
+            , mY(cell->getCell()->getGridY())
+            , mSceneManager(sceneManager)
             , mBulletShapeManager(bulletShapeManager)
             , mKeyframeManager(keyframeManager)
+            , mTerrain(terrain)
         {
             osg::Timer timer;
             ListModelsVisitor visitor (mMeshes);
@@ -86,8 +91,8 @@ namespace MWWorld
 
                     //std::cout << "preloading " << mesh << std::endl;
 
-                    mPreloadedNodes.push_back(mSceneManager->cacheInstance(mesh));
-                    mPreloadedShapes.push_back(mBulletShapeManager->cacheInstance(mesh));
+                    mPreloadedObjects.push_back(mSceneManager->cacheInstance(mesh));
+                    mPreloadedObjects.push_back(mBulletShapeManager->cacheInstance(mesh));
 
                     size_t slashpos = mesh.find_last_of("/\\");
                     if (slashpos != std::string::npos && slashpos != mesh.size()-1)
@@ -99,7 +104,7 @@ namespace MWWorld
                             if(kfname.size() > 4 && kfname.compare(kfname.size()-4, 4, ".nif") == 0)
                             {
                                 kfname.replace(kfname.size()-4, 4, ".kf");
-                                mPreloadedKeyframes.push_back(mKeyframeManager->get(kfname));
+                                mPreloadedObjects.push_back(mKeyframeManager->get(kfname));
                             }
 
                         }
@@ -111,29 +116,44 @@ namespace MWWorld
                     // error will be shown when visiting the cell
                 }
             }
-            std::cout << "preloaded " << mPreloadedNodes.size() << " nodes in " << preloadTimer.time_m() << std::endl;
+
+            if (mIsExterior)
+            {
+                try
+                {
+                    mPreloadedObjects.push_back(mTerrain->cacheCell(mX, mY));
+                }
+                catch(std::exception& e)
+                {
+                }
+            }
+
+            std::cout << "preloaded " << mPreloadedObjects.size() << " objects in " << preloadTimer.time_m() << std::endl;
         }
 
     private:
         typedef std::vector<std::string> MeshList;
+        bool mIsExterior;
+        int mX;
+        int mY;
         MeshList mMeshes;
         Resource::SceneManager* mSceneManager;
         Resource::BulletShapeManager* mBulletShapeManager;
         Resource::KeyframeManager* mKeyframeManager;
+        Terrain::World* mTerrain;
 
-        // keep a ref to the loaded object to make sure it stays loaded as long as this cell is in the preloaded state
-        std::vector<osg::ref_ptr<const osg::Node> > mPreloadedNodes;
-        std::vector<osg::ref_ptr<const Resource::BulletShapeInstance> > mPreloadedShapes;
-        std::vector<osg::ref_ptr<const NifOsg::KeyframeHolder> > mPreloadedKeyframes;
+        // keep a ref to the loaded objects to make sure it stays loaded as long as this cell is in the preloaded state
+        std::vector<osg::ref_ptr<const osg::Object> > mPreloadedObjects;
     };
 
     /// Worker thread item: update the resource system's cache, effectively deleting unused entries.
     class UpdateCacheItem : public SceneUtil::WorkItem
     {
     public:
-        UpdateCacheItem(Resource::ResourceSystem* resourceSystem, double referenceTime)
+        UpdateCacheItem(Resource::ResourceSystem* resourceSystem, Terrain::World* terrain, double referenceTime)
             : mReferenceTime(referenceTime)
             , mResourceSystem(resourceSystem)
+            , mTerrain(terrain)
         {
         }
 
@@ -141,17 +161,21 @@ namespace MWWorld
         {
             osg::Timer timer;
             mResourceSystem->updateCache(mReferenceTime);
+
+            mTerrain->updateCache();
             std::cout << "cleared cache in " << timer.time_m() << std::endl;
         }
 
     private:
         double mReferenceTime;
         Resource::ResourceSystem* mResourceSystem;
+        Terrain::World* mTerrain;
     };
 
-    CellPreloader::CellPreloader(Resource::ResourceSystem* resourceSystem, Resource::BulletShapeManager* bulletShapeManager)
+    CellPreloader::CellPreloader(Resource::ResourceSystem* resourceSystem, Resource::BulletShapeManager* bulletShapeManager, Terrain::World* terrain)
         : mResourceSystem(resourceSystem)
         , mBulletShapeManager(bulletShapeManager)
+        , mTerrain(terrain)
         , mExpiryDelay(0.0)
     {
     }
@@ -177,7 +201,7 @@ namespace MWWorld
             return;
         }
 
-        osg::ref_ptr<PreloadItem> item (new PreloadItem(cell, mResourceSystem->getSceneManager(), mBulletShapeManager, mResourceSystem->getKeyframeManager()));
+        osg::ref_ptr<PreloadItem> item (new PreloadItem(cell, mResourceSystem->getSceneManager(), mBulletShapeManager, mResourceSystem->getKeyframeManager(), mTerrain));
         mWorkQueue->addWorkItem(item);
 
         mPreloadCells[cell] = PreloadEntry(timestamp, item);
@@ -201,7 +225,7 @@ namespace MWWorld
         }
 
         // the resource cache is cleared from the worker thread so that we're not holding up the main thread with delete operations
-        mWorkQueue->addWorkItem(new UpdateCacheItem(mResourceSystem, timestamp));
+        mWorkQueue->addWorkItem(new UpdateCacheItem(mResourceSystem, mTerrain, timestamp));
     }
 
     void CellPreloader::setExpiryDelay(double expiryDelay)
diff --git a/apps/openmw/mwworld/cellpreloader.hpp b/apps/openmw/mwworld/cellpreloader.hpp
index 55e40dcbd..32ea194c6 100644
--- a/apps/openmw/mwworld/cellpreloader.hpp
+++ b/apps/openmw/mwworld/cellpreloader.hpp
@@ -11,6 +11,11 @@ namespace Resource
     class BulletShapeManager;
 }
 
+namespace Terrain
+{
+    class World;
+}
+
 namespace MWWorld
 {
     class CellStore;
@@ -18,7 +23,7 @@ namespace MWWorld
     class CellPreloader
     {
     public:
-        CellPreloader(Resource::ResourceSystem* resourceSystem, Resource::BulletShapeManager* bulletShapeManager);
+        CellPreloader(Resource::ResourceSystem* resourceSystem, Resource::BulletShapeManager* bulletShapeManager, Terrain::World* terrain);
 
         /// Ask a background thread to preload rendering meshes and collision shapes for objects in this cell.
         /// @note The cell itself must be in State_Loaded or State_Preloaded.
@@ -37,6 +42,7 @@ namespace MWWorld
     private:
         Resource::ResourceSystem* mResourceSystem;
         Resource::BulletShapeManager* mBulletShapeManager;
+        Terrain::World* mTerrain;
         osg::ref_ptr<SceneUtil::WorkQueue> mWorkQueue;
         double mExpiryDelay;
 
diff --git a/apps/openmw/mwworld/scene.cpp b/apps/openmw/mwworld/scene.cpp
index b0e384493..0be26c7b6 100644
--- a/apps/openmw/mwworld/scene.cpp
+++ b/apps/openmw/mwworld/scene.cpp
@@ -416,7 +416,6 @@ namespace MWWorld
         mCellChanged = true;
 
         mPreloader->updateCache(mRendering.getReferenceTime());
-        mRendering.clearCache();
 
         std::cout << "changeCellGrid took " << timer.time_m() << std::endl;
     }
@@ -463,7 +462,7 @@ namespace MWWorld
     , mPreloadDoors(Settings::Manager::getBool("preload doors", "Cells"))
     , mPreloadFastTravel(Settings::Manager::getBool("preload fast travel", "Cells"))
     {
-        mPreloader.reset(new CellPreloader(rendering.getResourceSystem(), physics->getShapeManager()));
+        mPreloader.reset(new CellPreloader(rendering.getResourceSystem(), physics->getShapeManager(), rendering.getTerrain()));
         mPreloader->setWorkQueue(mRendering.getWorkQueue());
 
         mPhysics->setUnrefQueue(rendering.getUnrefQueue());
@@ -549,7 +548,6 @@ namespace MWWorld
         MWBase::Environment::get().getWindowManager()->changeCell(mCurrentCell);
 
         mPreloader->updateCache(mRendering.getReferenceTime());
-        mRendering.clearCache();
 
         std::cout << "change to interior took " << timer.time_m() << std::endl;
     }
diff --git a/components/resource/resourcemanager.cpp b/components/resource/resourcemanager.cpp
index e5f6d9f43..0a9784e6b 100644
--- a/components/resource/resourcemanager.cpp
+++ b/components/resource/resourcemanager.cpp
@@ -19,11 +19,6 @@ namespace Resource
         mCache->removeExpiredObjectsInCache(referenceTime - mExpiryDelay);
     }
 
-    void ResourceManager::clearCache()
-    {
-        mCache->clear();
-    }
-
     void ResourceManager::setExpiryDelay(double expiryDelay)
     {
         mExpiryDelay = expiryDelay;
diff --git a/components/resource/resourcemanager.hpp b/components/resource/resourcemanager.hpp
index d2a1d1023..34fce0145 100644
--- a/components/resource/resourcemanager.hpp
+++ b/components/resource/resourcemanager.hpp
@@ -22,9 +22,6 @@ namespace Resource
         /// Clear cache entries that have not been referenced for longer than expiryDelay.
         virtual void updateCache(double referenceTime);
 
-        /// Clear all cache entries regardless of having external references.
-        virtual void clearCache();
-
         /// How long to keep objects in cache after no longer being referenced.
         void setExpiryDelay (double expiryDelay);
 
diff --git a/components/terrain/buffercache.cpp b/components/terrain/buffercache.cpp
index f9c860d47..2a72ea59b 100644
--- a/components/terrain/buffercache.cpp
+++ b/components/terrain/buffercache.cpp
@@ -2,6 +2,8 @@
 
 #include <cassert>
 
+#include <OpenThreads/ScopedLock>
+
 #include <osg/PrimitiveSet>
 
 #include "defs.hpp"
@@ -178,6 +180,7 @@ namespace Terrain
 
     osg::ref_ptr<osg::Vec2Array> BufferCache::getUVBuffer()
     {
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mUvBufferMutex);
         if (mUvBufferMap.find(mNumVerts) != mUvBufferMap.end())
         {
             return mUvBufferMap[mNumVerts];
@@ -206,6 +209,7 @@ namespace Terrain
 
     osg::ref_ptr<osg::DrawElements> BufferCache::getIndexBuffer(unsigned int flags)
     {
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mIndexBufferMutex);
         unsigned int verts = mNumVerts;
 
         if (mIndexBufferMap.find(flags) != mIndexBufferMap.end())
diff --git a/components/terrain/buffercache.hpp b/components/terrain/buffercache.hpp
index ca210f238..d1a57f811 100644
--- a/components/terrain/buffercache.hpp
+++ b/components/terrain/buffercache.hpp
@@ -17,8 +17,10 @@ namespace Terrain
 
         /// @param flags first 4*4 bits are LOD deltas on each edge, respectively (4 bits each)
         ///              next 4 bits are LOD level of the index buffer (LOD 0 = don't omit any vertices)
+        /// @note Thread safe.
         osg::ref_ptr<osg::DrawElements> getIndexBuffer (unsigned int flags);
 
+        /// @note Thread safe.
         osg::ref_ptr<osg::Vec2Array> getUVBuffer();
 
         // TODO: add releaseGLObjects() for our vertex/element buffer objects
@@ -27,8 +29,10 @@ namespace Terrain
         // Index buffers are shared across terrain batches where possible. There is one index buffer for each
         // combination of LOD deltas and index buffer LOD we may need.
         std::map<int, osg::ref_ptr<osg::DrawElements> > mIndexBufferMap;
+        OpenThreads::Mutex mIndexBufferMutex;
 
         std::map<int, osg::ref_ptr<osg::Vec2Array> > mUvBufferMap;
+        OpenThreads::Mutex mUvBufferMutex;
 
         unsigned int mNumVerts;
     };
diff --git a/components/terrain/terraingrid.cpp b/components/terrain/terraingrid.cpp
index 4d2f421e6..5b1854abc 100644
--- a/components/terrain/terraingrid.cpp
+++ b/components/terrain/terraingrid.cpp
@@ -2,6 +2,8 @@
 
 #include <memory>
 
+#include <OpenThreads/ScopedLock>
+
 #include <components/resource/resourcesystem.hpp>
 #include <components/resource/imagemanager.hpp>
 #include <components/resource/scenemanager.hpp>
@@ -50,9 +52,9 @@ namespace Terrain
 TerrainGrid::TerrainGrid(osg::Group* parent, Resource::ResourceSystem* resourceSystem, osgUtil::IncrementalCompileOperation* ico, Storage* storage, int nodeMask, SceneUtil::UnrefQueue* unrefQueue)
     : Terrain::World(parent, resourceSystem, ico, storage, nodeMask)
     , mNumSplits(4)
+    , mCache((storage->getCellVertices()-1)/static_cast<float>(mNumSplits) + 1)
     , mUnrefQueue(unrefQueue)
 {
-    mCache = BufferCache((storage->getCellVertices()-1)/static_cast<float>(mNumSplits) + 1);
 }
 
 TerrainGrid::~TerrainGrid()
@@ -63,6 +65,21 @@ TerrainGrid::~TerrainGrid()
     }
 }
 
+osg::ref_ptr<osg::Node> TerrainGrid::cacheCell(int x, int y)
+{
+    {
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mGridCacheMutex);
+        Grid::iterator found = mGridCache.find(std::make_pair(x,y));
+        if (found != mGridCache.end())
+            return found->second;
+    }
+    osg::ref_ptr<osg::Node> node = buildTerrain(NULL, 1.f, osg::Vec2f(x+0.5, y+0.5));
+
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mGridCacheMutex);
+    mGridCache.insert(std::make_pair(std::make_pair(x,y), node));
+    return node;
+}
+
 osg::ref_ptr<osg::Node> TerrainGrid::buildTerrain (osg::Group* parent, float chunkSize, const osg::Vec2f& chunkCenter)
 {
     if (chunkSize * mNumSplits > 1.f)
@@ -131,19 +148,22 @@ osg::ref_ptr<osg::Node> TerrainGrid::buildTerrain (osg::Group* parent, float chu
         unsigned int dummyTextureCounter = 0;
 
         std::vector<osg::ref_ptr<osg::Texture2D> > layerTextures;
-        for (std::vector<LayerInfo>::const_iterator it = layerList.begin(); it != layerList.end(); ++it)
         {
-            osg::ref_ptr<osg::Texture2D> texture = mTextureCache[it->mDiffuseMap];
-            if (!texture)
+            OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mTextureCacheMutex);
+            for (std::vector<LayerInfo>::const_iterator it = layerList.begin(); it != layerList.end(); ++it)
             {
-                texture = new osg::Texture2D(mResourceSystem->getImageManager()->getImage(it->mDiffuseMap));
-                texture->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
-                texture->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
-                mResourceSystem->getSceneManager()->applyFilterSettings(texture);
-                mTextureCache[it->mDiffuseMap] = texture;
+                osg::ref_ptr<osg::Texture2D> texture = mTextureCache[it->mDiffuseMap];
+                if (!texture)
+                {
+                    texture = new osg::Texture2D(mResourceSystem->getImageManager()->getImage(it->mDiffuseMap));
+                    texture->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
+                    texture->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
+                    mResourceSystem->getSceneManager()->applyFilterSettings(texture);
+                    mTextureCache[it->mDiffuseMap] = texture;
+                }
+                layerTextures.push_back(texture);
+                textureCompileDummy->getOrCreateStateSet()->setTextureAttributeAndModes(dummyTextureCounter++, layerTextures.back());
             }
-            layerTextures.push_back(texture);
-            textureCompileDummy->getOrCreateStateSet()->setTextureAttributeAndModes(dummyTextureCounter++, layerTextures.back());
         }
 
         std::vector<osg::ref_ptr<osg::Texture2D> > blendmapTextures;
@@ -196,11 +216,27 @@ void TerrainGrid::loadCell(int x, int y)
     if (mGrid.find(std::make_pair(x, y)) != mGrid.end())
         return; // already loaded
 
-    osg::Vec2f center(x+0.5f, y+0.5f);
+    // try to get it from the cache
+    osg::ref_ptr<osg::Node> terrainNode;
+    {
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mGridCacheMutex);
+        Grid::const_iterator found = mGridCache.find(std::make_pair(x,y));
+        if (found != mGridCache.end())
+        {
+            terrainNode = found->second;
+            if (!terrainNode)
+                return; // no terrain defined
+        }
+    }
 
-    osg::ref_ptr<osg::Node> terrainNode = buildTerrain(NULL, 1.f, center);
+    // didn't find in cache, build it
     if (!terrainNode)
-        return; // no terrain defined
+    {
+        osg::Vec2f center(x+0.5f, y+0.5f);
+        terrainNode = buildTerrain(NULL, 1.f, center);
+        if (!terrainNode)
+            return; // no terrain defined
+    }
 
     mTerrainRoot->addChild(terrainNode);
 
@@ -213,7 +249,7 @@ void TerrainGrid::unloadCell(int x, int y)
     if (it == mGrid.end())
         return;
 
-    osg::Node* terrainNode = it->second;
+    osg::ref_ptr<osg::Node> terrainNode = it->second;
     mTerrainRoot->removeChild(terrainNode);
 
     if (mUnrefQueue.get())
@@ -222,18 +258,28 @@ void TerrainGrid::unloadCell(int x, int y)
     mGrid.erase(it);
 }
 
-void TerrainGrid::clearCache()
+void TerrainGrid::updateCache()
 {
-    for (TextureCache::iterator it = mTextureCache.begin(); it != mTextureCache.end();)
     {
-        if (it->second->referenceCount() <= 1)
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mTextureCacheMutex);
+        for (TextureCache::iterator it = mTextureCache.begin(); it != mTextureCache.end();)
         {
-            if (mUnrefQueue.get())
-                mUnrefQueue->push(it->second);
-            mTextureCache.erase(it++);
+            if (it->second->referenceCount() <= 1)
+                mTextureCache.erase(it++);
+            else
+                ++it;
+        }
+    }
+
+    {
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mGridCacheMutex);
+        for (Grid::iterator it = mGridCache.begin(); it != mGridCache.end();)
+        {
+            if (it->second->referenceCount() <= 1)
+                mGridCache.erase(it++);
+            else
+                ++it;
         }
-        else
-            ++it;
     }
 }
 
diff --git a/components/terrain/terraingrid.hpp b/components/terrain/terraingrid.hpp
index 4e6a78abd..46a95e817 100644
--- a/components/terrain/terraingrid.hpp
+++ b/components/terrain/terraingrid.hpp
@@ -21,11 +21,20 @@ namespace Terrain
         TerrainGrid(osg::Group* parent, Resource::ResourceSystem* resourceSystem, osgUtil::IncrementalCompileOperation* ico, Storage* storage, int nodeMask, SceneUtil::UnrefQueue* unrefQueue = NULL);
         ~TerrainGrid();
 
+        /// Load a terrain cell and store it in cache for later use.
+        /// @note The returned ref_ptr should be kept by the caller to ensure that the terrain stays in cache for as long as needed.
+        /// @note Thread safe.
+        virtual osg::ref_ptr<osg::Node> cacheCell(int x, int y);
+
+        /// @note Not thread safe.
         virtual void loadCell(int x, int y);
+
+        /// @note Not thread safe.
         virtual void unloadCell(int x, int y);
 
-        /// Clear cached textures that are no longer referenced
-        void clearCache();
+        /// Clear cached objects that are no longer referenced
+        /// @note Thread safe.
+        void updateCache();
 
     private:
         osg::ref_ptr<osg::Node> buildTerrain (osg::Group* parent, float chunkSize, const osg::Vec2f& chunkCenter);
@@ -35,10 +44,16 @@ namespace Terrain
 
         typedef std::map<std::string, osg::ref_ptr<osg::Texture2D> >  TextureCache;
         TextureCache mTextureCache;
+        OpenThreads::Mutex mTextureCacheMutex;
 
         typedef std::map<std::pair<int, int>, osg::ref_ptr<osg::Node> > Grid;
         Grid mGrid;
 
+        Grid mGridCache;
+        OpenThreads::Mutex mGridCacheMutex;
+
+        BufferCache mCache;
+
         osg::ref_ptr<SceneUtil::UnrefQueue> mUnrefQueue;
     };
 
diff --git a/components/terrain/world.cpp b/components/terrain/world.cpp
index 2250b593d..b56e87e1d 100644
--- a/components/terrain/world.cpp
+++ b/components/terrain/world.cpp
@@ -11,7 +11,6 @@ namespace Terrain
 World::World(osg::Group* parent, Resource::ResourceSystem* resourceSystem, osgUtil::IncrementalCompileOperation* ico,
              Storage* storage, int nodeMask)
     : mStorage(storage)
-    , mCache(storage->getCellVertices())
     , mParent(parent)
     , mResourceSystem(resourceSystem)
     , mIncrementalCompileOperation(ico)
diff --git a/components/terrain/world.hpp b/components/terrain/world.hpp
index bd5d0a466..992438a6a 100644
--- a/components/terrain/world.hpp
+++ b/components/terrain/world.hpp
@@ -39,10 +39,12 @@ namespace Terrain
               Storage* storage, int nodeMask);
         virtual ~World();
 
-        virtual void clearCache() {}
+        virtual void updateCache() {}
 
         float getHeightAt (const osg::Vec3f& worldPos);
 
+        virtual osg::ref_ptr<osg::Node> cacheCell(int x, int y) {return NULL;}
+
         // This is only a hint and may be ignored by the implementation.
         virtual void loadCell(int x, int y) {}
         virtual void unloadCell(int x, int y) {}
@@ -52,8 +54,6 @@ namespace Terrain
     protected:
         Storage* mStorage;
 
-        BufferCache mCache;
-
         osg::ref_ptr<osg::Group> mParent;
         osg::ref_ptr<osg::Group> mTerrainRoot;