diff --git a/apps/opencs/model/world/idtableproxymodel.cpp b/apps/opencs/model/world/idtableproxymodel.cpp
index 516644713..ce9d44ed6 100644
--- a/apps/opencs/model/world/idtableproxymodel.cpp
+++ b/apps/opencs/model/world/idtableproxymodel.cpp
@@ -50,6 +50,24 @@ QModelIndex CSMWorld::IdTableProxyModel::getModelIndex (const std::string& id, i
     return mapFromSource (dynamic_cast<IdTableBase&> (*sourceModel()).getModelIndex (id, column));
 }
 
+void CSMWorld::IdTableProxyModel::setSourceModel(QAbstractItemModel *model)
+{
+    QSortFilterProxyModel::setSourceModel(model);
+
+    connect(sourceModel(), 
+            SIGNAL(rowsRemoved(const QModelIndex &, int, int)), 
+            this, 
+            SLOT(sourceRowsChanged(const QModelIndex &, int, int)));
+    connect(sourceModel(), 
+            SIGNAL(rowsInserted(const QModelIndex &, int, int)), 
+            this, 
+            SLOT(sourceRowsChanged(const QModelIndex &, int, int)));
+    connect(sourceModel(), 
+            SIGNAL(dataChanged(const QModelIndex &, const QModelIndex &)), 
+            this, 
+            SLOT(sourceDataChanged(const QModelIndex &, const QModelIndex &)));
+}
+
 void CSMWorld::IdTableProxyModel::setFilter (const boost::shared_ptr<CSMFilter::Node>& filter)
 {
     beginResetModel();
@@ -60,6 +78,20 @@ void CSMWorld::IdTableProxyModel::setFilter (const boost::shared_ptr<CSMFilter::
 
 bool CSMWorld::IdTableProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
 {
+    Columns::ColumnId id = static_cast<Columns::ColumnId>(left.data(ColumnBase::Role_ColumnId).toInt());
+    EnumColumnCache::const_iterator valuesIt = mEnumColumnCache.find(id);
+    if (valuesIt == mEnumColumnCache.end())
+    {
+        if (Columns::hasEnums(id))
+        {
+            valuesIt = mEnumColumnCache.insert(std::make_pair(id, Columns::getEnums(id))).first;
+        }
+    }
+
+    if (valuesIt != mEnumColumnCache.end())
+    {
+        return valuesIt->second[left.data().toInt()] < valuesIt->second[right.data().toInt()];
+    }
     return QSortFilterProxyModel::lessThan(left, right);
 }
 
@@ -68,3 +100,13 @@ void CSMWorld::IdTableProxyModel::refreshFilter()
     updateColumnMap();
     invalidateFilter();
 }
+
+void CSMWorld::IdTableProxyModel::sourceRowsChanged(const QModelIndex &/*parent*/, int /*start*/, int /*end*/)
+{
+    refreshFilter();
+}
+
+void CSMWorld::IdTableProxyModel::sourceDataChanged(const QModelIndex &/*topLeft*/, const QModelIndex &/*bottomRight*/)
+{
+    refreshFilter();
+}
diff --git a/apps/opencs/model/world/idtableproxymodel.hpp b/apps/opencs/model/world/idtableproxymodel.hpp
index d2a240529..17c30361a 100644
--- a/apps/opencs/model/world/idtableproxymodel.hpp
+++ b/apps/opencs/model/world/idtableproxymodel.hpp
@@ -11,6 +11,8 @@
 
 #include "../filter/node.hpp"
 
+#include "columns.hpp"
+
 namespace CSMWorld
 {
     class IdTableProxyModel : public QSortFilterProxyModel
@@ -20,6 +22,11 @@ namespace CSMWorld
             boost::shared_ptr<CSMFilter::Node> mFilter;
             std::map<int, int> mColumnMap; // column ID, column index in this model (or -1)
 
+            // Cache of enum values for enum columns (e.g. Modified, Record Type).
+            // Used to speed up comparisons during the sort by such columns.
+            typedef std::map<Columns::ColumnId, std::vector<std::string> > EnumColumnCache;
+            mutable EnumColumnCache mEnumColumnCache;
+
         private:
 
             void updateColumnMap();
@@ -30,6 +37,8 @@ namespace CSMWorld
 
             virtual QModelIndex getModelIndex (const std::string& id, int column) const;
 
+            virtual void setSourceModel(QAbstractItemModel *model);
+
             void setFilter (const boost::shared_ptr<CSMFilter::Node>& filter);
 
             void refreshFilter();
@@ -39,6 +48,12 @@ namespace CSMWorld
             bool lessThan(const QModelIndex &left, const QModelIndex &right) const;
 
             virtual bool filterAcceptsRow (int sourceRow, const QModelIndex& sourceParent) const;
+
+        private slots:
+
+            void sourceRowsChanged(const QModelIndex &parent, int start, int end);
+
+            void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
     };
 }
 
diff --git a/apps/opencs/view/world/table.cpp b/apps/opencs/view/world/table.cpp
index 74343a5f6..5a2a572e2 100644
--- a/apps/opencs/view/world/table.cpp
+++ b/apps/opencs/view/world/table.cpp
@@ -653,10 +653,6 @@ void CSVWorld::Table::tableSizeUpdate()
     }
 
     emit tableSizeChanged (size, deleted, modified);
-
-    // not really related to tableSizeUpdate() but placed here for convenience rather than
-    // creating a bunch of extra connections & slot
-    mProxyModel->refreshFilter();
 }
 
 void CSVWorld::Table::selectionSizeUpdate()