benchmark

% time ./node benchmark/fast_buffer2_creation.js 
./node benchmark/fast_buffer2_creation.js  0.34s user 0.01s system 79% cpu 0.450 total

% time ./node benchmark/fast_buffer_creation.js 
./node benchmark/fast_buffer_creation.js  0.52s user 0.02s system 97% cpu 0.549 total

% time ./node benchmark/buffer_creation.js      
./node benchmark/buffer_creation.js  2.61s user 0.63s system 117% cpu 2.758 total

no-alloc.patch

diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index d2335ff..0d8b3b0 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -201,6 +201,7 @@ Buffer::~Buffer() {
   Replace(NULL, 0, NULL, NULL);
 }
 
+static char bigbuffer[10 * 1024 * 1024];
 
 void Buffer::Replace(char *data, size_t length,
                      free_callback callback, void *hint) {
@@ -209,7 +210,7 @@ void Buffer::Replace(char *data, size_t length,
   if (callback_) {
     callback_(data_, callback_hint_);
   } else if (length_) {
-    delete [] data_;
+    //delete [] data_;
     V8::AdjustAmountOfExternalAllocatedMemory(-(sizeof(Buffer) + length_));
   }
 
@@ -220,7 +221,7 @@ void Buffer::Replace(char *data, size_t length,
   if (callback_) {
     data_ = data;
   } else if (length_) {
-    data_ = new char[length_];
+    data_ = bigbuffer;
     if (data)
       memcpy(data_, data, length_);
     V8::AdjustAmountOfExternalAllocatedMemory(sizeof(Buffer) + length_);