diff --git a/ChangeLog b/ChangeLog
index 185ecf7a..7f135e11 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-11-17  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Moved frequently called methods to header file so they get
+	inlined.
+	* src/RequestSlot.cc
+	* src/RequestSlot.h
+
 2009-11-15  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Copied in_addr instead of just casting from char* which might
diff --git a/src/RequestSlot.cc b/src/RequestSlot.cc
index e1838a35..e007ca62 100644
--- a/src/RequestSlot.cc
+++ b/src/RequestSlot.cc
@@ -33,59 +33,11 @@
  */
 /* copyright --> */
 #include "RequestSlot.h"
-#include "util.h"
 
 namespace aria2 {
 
 RequestSlot RequestSlot::nullSlot = RequestSlot();
 
-RequestSlot::RequestSlot(size_t index, uint32_t begin, size_t length, size_t blockIndex, const SharedHandle<Piece>& piece)
-  :index(index), begin(begin), length(length), blockIndex(blockIndex),
-   _piece(piece) {}
-
-RequestSlot::RequestSlot(const RequestSlot& requestSlot) {
-  copy(requestSlot);
-}
-
-RequestSlot::RequestSlot():index(0), begin(0), length(0), blockIndex(0) {}
-
-void RequestSlot::copy(const RequestSlot& requestSlot) {
-  index = requestSlot.index;
-  begin = requestSlot.begin;
-  length = requestSlot.length;
-  blockIndex = requestSlot.blockIndex;
-  dispatchedTime = requestSlot.dispatchedTime;
-  _piece = requestSlot._piece;
-}
-
-RequestSlot& RequestSlot::operator=(const RequestSlot& requestSlot)
-{
-  if(this != &requestSlot) {
-    copy(requestSlot);
-  }
-  return *this;
-}
-
-bool RequestSlot::operator==(const RequestSlot& requestSlot) const
-{
-  return index == requestSlot.index && begin == requestSlot.begin
-    && length == requestSlot.length;
-}
-
-bool RequestSlot::operator!=(const RequestSlot& requestSlot) const
-{
-  return !(*this == requestSlot);
-}
-
-bool RequestSlot::operator<(const RequestSlot& requestSlot) const
-{
-  if(index == requestSlot.index) {
-    return begin < requestSlot.begin;
-  } else {
-    return index < requestSlot.index;
-  }
-}
-
 void RequestSlot::setDispatchedTime() {
   dispatchedTime.reset();
 }
diff --git a/src/RequestSlot.h b/src/RequestSlot.h
index 1c9c6fed..5c25b816 100644
--- a/src/RequestSlot.h
+++ b/src/RequestSlot.h
@@ -59,24 +59,59 @@ private:
   // at the construction of RequestSlot as a cache.
   SharedHandle<Piece> _piece;
 
-  void copy(const RequestSlot& requestSlot);
+  // inlined for performance reason
+  void copy(const RequestSlot& requestSlot)
+  {
+    index = requestSlot.index;
+    begin = requestSlot.begin;
+    length = requestSlot.length;
+    blockIndex = requestSlot.blockIndex;
+    dispatchedTime = requestSlot.dispatchedTime;
+    _piece = requestSlot._piece;
+  }
 public:
+  
   RequestSlot(size_t index, uint32_t begin, size_t length, size_t blockIndex,
-	      const SharedHandle<Piece>& piece = SharedHandle<Piece>());
+	      const SharedHandle<Piece>& piece = SharedHandle<Piece>()):
+    index(index), begin(begin), length(length), blockIndex(blockIndex),
+    _piece(piece) {}
 
-  RequestSlot(const RequestSlot& requestSlot);
+  RequestSlot(const RequestSlot& requestSlot)
+  {
+    copy(requestSlot);
+  }
 
-  RequestSlot();
+  RequestSlot():index(0), begin(0), length(0), blockIndex(0) {}
 
   ~RequestSlot() {}
 
-  RequestSlot& operator=(const RequestSlot& requestSlot);
+  RequestSlot& operator=(const RequestSlot& requestSlot)
+  {
+    if(this != &requestSlot) {
+      copy(requestSlot);
+    }
+    return *this;
+  }
 
-  bool operator==(const RequestSlot& requestSlot) const;
+  bool operator==(const RequestSlot& requestSlot) const
+  {
+    return index == requestSlot.index && begin == requestSlot.begin
+      && length == requestSlot.length;
+  }
 
-  bool operator!=(const RequestSlot& requestSlot) const;
-
-  bool operator<(const RequestSlot& requestSlot) const;
+  bool operator!=(const RequestSlot& requestSlot) const
+  {
+    return !(*this == requestSlot);
+  }
+  
+  bool operator<(const RequestSlot& requestSlot) const
+  {
+    if(index == requestSlot.index) {
+      return begin < requestSlot.begin;
+    } else {
+      return index < requestSlot.index;
+    }
+  }
 
   void setDispatchedTime();
   void setDispatchedTime(time_t secFromEpoch);