diff --git a/.vscode/launch.json b/.vscode/launch.json
index f750daa..9f1afcc 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -31,6 +31,24 @@
             "environment": [],
             "console": "externalTerminal"
         },
+        {
+            "name": "Launch Release (Windows)",
+            "type": "cppvsdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/build/tsbp-cli/Release/tsbp.exe",
+            "args": [
+                "-i",
+                "${workspaceFolder}/data/input/CJCM08/",
+                "-f",
+                "E00N10.json",
+                "-o",
+                "${workspaceFolder}/data/output/"
+            ],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "console": "externalTerminal"
+        },
         {
             "name": "Launch Test Debug (Windows)",
             "type": "cppvsdbg",
diff --git a/tsbp/CMakeLists.txt b/tsbp/CMakeLists.txt
index 19a1ed5..420640c 100644
--- a/tsbp/CMakeLists.txt
+++ b/tsbp/CMakeLists.txt
@@ -40,6 +40,7 @@ add_library(tsbp-lib
     "include/tsbp/OrthogonalPackingSolver2D.h"
     "include/tsbp/Serialization.h"
     "include/tsbp/Preprocess.h"
+    "${CMAKE_SOURCE_DIR}/external/ltalloc/ltalloc.cc"
     )
 
 if(UNIX)
diff --git a/tsbp/include/tsbp/Preprocess.h b/tsbp/include/tsbp/Preprocess.h
index 66e309d..770226b 100644
--- a/tsbp/include/tsbp/Preprocess.h
+++ b/tsbp/include/tsbp/Preprocess.h
@@ -22,6 +22,8 @@ class PreprocessPacking2D
     Bin container;
     InputParameters parameters;
 
+    void InitializeInternIds(std::vector<Rectangle>& items);
+
     void RemoveLargeItems(std::vector<Rectangle>& items, Bin& container);
     void FilterFrameConfigurations(std::vector<Rectangle>& items, Bin& container);
 
diff --git a/tsbp/src/Preprocess.cpp b/tsbp/src/Preprocess.cpp
index 27355aa..05853ee 100644
--- a/tsbp/src/Preprocess.cpp
+++ b/tsbp/src/Preprocess.cpp
@@ -12,6 +12,8 @@ namespace tsbp
 
 void PreprocessPacking2D::Run()
 {
+    InitializeInternIds(this->items);
+
     std::vector<Rectangle> newItems = this->items;
     Bin newContainer = this->container;
 
@@ -25,10 +27,21 @@ void PreprocessPacking2D::Run()
     std::cout << "Preprocess removed " << this->items.size() - newItems.size() << " items "
               << "and reduced container area by " << this->container.Area - newContainer.Area << ".\n";
 
+    InitializeInternIds(newItems);
+
     PreprocessedContainer = newContainer;
     ProcessedItems = newItems;
 }
 
+void PreprocessPacking2D::InitializeInternIds(std::vector<Rectangle>& items)
+{
+    for (size_t i = 0; i < items.size(); i++)
+    {
+        Rectangle& item = items[i];
+        item.InternId = i;
+    }
+}
+
 void PreprocessPacking2D::RemoveLargeItems(std::vector<Rectangle>& items, Bin& container)
 {
     bool removedItem = true;