diff --git a/lib/Epub/Epub/parsers/ContentOpfParser.cpp b/lib/Epub/Epub/parsers/ContentOpfParser.cpp
index 963d4fd0..0cecc1d5 100644
--- a/lib/Epub/Epub/parsers/ContentOpfParser.cpp
+++ b/lib/Epub/Epub/parsers/ContentOpfParser.cpp
@@ -128,6 +128,9 @@ size_t ContentOpfParser::write(const uint8_t data) { return write(&data, 1); }
 size_t ContentOpfParser::write(const uint8_t* buffer, const size_t size) {
   if (!parser) return 0;
 
+  stats.writeCalls++;
+  stats.bytesParsed += size;
+
   const uint8_t* currentBufferPos = buffer;
   auto remainingInBuffer = size;
 
diff --git a/lib/Epub/Epub/parsers/ContentOpfParser.h b/lib/Epub/Epub/parsers/ContentOpfParser.h
index f7ae5430..9ff76917 100644
--- a/lib/Epub/Epub/parsers/ContentOpfParser.h
+++ b/lib/Epub/Epub/parsers/ContentOpfParser.h
@@ -61,6 +61,18 @@ class ContentOpfParser final : public Print {
   static void endElement(void* userData, const XML_Char* name);
 
  public:
+  struct Stats {
+    uint32_t writeCalls = 0;
+    uint32_t bytesParsed = 0;
+    uint32_t parseBufferMs = 0;
+    uint32_t manifestOpenMs = 0;
+    uint32_t spineOpenMs = 0;
+    uint32_t guideOpenMs = 0;
+    uint32_t itemRefCount = 0;
+    uint32_t itemRefLookupMs = 0;
+    uint32_t createSpineEntryMs = 0;
+  } stats;
+
   std::string title;
   std::string author;
   std::string language;