diff --git a/example/example.cpp b/example/example.cpp
index 3a8a21e2..ed825cc6 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -18,7 +18,7 @@ using namespace utils;
 int main(int argc, char* argv[])
 {
 	
-    const unsigned int howmany = argc <= 1 ? 1000000:atoi(argv[1]);
+    const unsigned int howmany = argc <= 1 ? 4000000:atoi(argv[1]);
 
     logger cout_logger ("", sinks::stdout_sink());
     cout_logger.set_min_level(c11log::level::TRACE);
@@ -28,7 +28,7 @@ int main(int argc, char* argv[])
     auto fsink = std::make_shared<sinks::rotating_file_sink>("log", "txt", 1024*1024*50 , 5, 0);
     auto nullsink = sinks::null_sink::get();
     //auto as = std::make_shared<sinks::async_sink>(1000);
-    //as->add_sink(sinks::null_sink::get());
+    //as->add_sink(fsink);
 
     logger my_logger ("my_logger", nullsink);
 
@@ -37,6 +37,7 @@ int main(int argc, char* argv[])
     for(unsigned int i = 1; i <= howmany ; ++i)
         my_logger.info("Hello logger: ") << 4.5 <<'\t' << i << "\tasdasd:" << 123 << 'f';
 
+	//as->shutdown(std::chrono::milliseconds(15000));
     auto delta = system_clock::now() - start;
     auto delta_d = duration_cast<duration<double>> (delta).count();
 
diff --git a/example/makefile b/example/makefile
index 907a179a..39a9f14c 100644
--- a/example/makefile
+++ b/example/makefile
@@ -1,6 +1,6 @@
 CXX	= g++
 CXXFLAGS	= -march=native -Wall -Wextra -Wshadow -pedantic -std=c++11 -pthread -I../include 
-CXX_RELEASE_FLAGS = -O3 -flto -g
+CXX_RELEASE_FLAGS = -O3 -flto
 CXX_DEBUG_FLAGS= -g 
 
 OUTBIN  = example
diff --git a/include/c11log/common_types.h b/include/c11log/common_types.h
index dafd48e9..527996bd 100644
--- a/include/c11log/common_types.h
+++ b/include/c11log/common_types.h
@@ -6,7 +6,6 @@ namespace c11log
 {
 
 typedef std::chrono::system_clock log_clock;
-typedef std::pair<const char*, std::size_t> bufpair_t;
 
 namespace level
 {
diff --git a/include/c11log/details/flush_helper.h b/include/c11log/details/flush_helper.h
index f4827324..084f7447 100644
--- a/include/c11log/details/flush_helper.h
+++ b/include/c11log/details/flush_helper.h
@@ -12,10 +12,10 @@ public:
     explicit file_flush_helper(const std::size_t flush_every):
         _flush_every(flush_every),
         _write_counter(0) {};
-
-    void write(const bufpair_t& msg, std::ofstream& ofs)
+  	
+	void write(const std::string& msg, std::ofstream& ofs)
     {
-        ofs.write(msg.first, msg.second);
+        ofs.write(msg.data(), msg.size());
         if(++_write_counter == _flush_every)
         {
             ofs.flush();
diff --git a/include/c11log/details/line_logger.h b/include/c11log/details/line_logger.h
index 6183c509..03d47e5c 100644
--- a/include/c11log/details/line_logger.h
+++ b/include/c11log/details/line_logger.h
@@ -1,8 +1,9 @@
 #pragma once
 
+#include <sstream>
 #include "../common_types.h"
 #include "../logger.h"
-#include "stack_oss.h"
+
 
 // line_logger class.
 // aggregates single log line (on the stack if possibe) and calls the logger upon destruction
@@ -30,7 +31,7 @@ public:
                     _log_msg.msg_level,
                     _log_msg.msg_time,
                     _oss);
-            _log_msg.msg_header_size = _oss.size();
+            _log_msg.msg_header_size = _oss.str().size();
         }
     }
 
@@ -43,7 +44,7 @@ public:
     line_logger(line_logger&& other) :
         _callback_logger(other._callback_logger),
         _log_msg(std::move(other._log_msg)),
-        _oss(std::move(other._oss)),
+        _oss(std::move(other._oss.str())),
         _enabled(other._enabled),
 		_empty(other._empty)
 		{
@@ -58,7 +59,7 @@ public:
         if (_enabled && !_empty)
         {
             _oss << os::eol();
-            _log_msg.msg_buf = _oss.buf();
+            _log_msg.str = _oss.str();
             _callback_logger->_log_it(_log_msg);
         }
     }
@@ -90,7 +91,8 @@ public:
 private:
     logger* _callback_logger;
     log_msg _log_msg;
-    details::stack_oss _oss;
+    //details::stack_oss _oss;
+	std::ostringstream _oss;
     bool _enabled;
     bool _empty;
 };
diff --git a/include/c11log/details/log_msg.h b/include/c11log/details/log_msg.h
index 4eb3ee87..85fda0ba 100644
--- a/include/c11log/details/log_msg.h
+++ b/include/c11log/details/log_msg.h
@@ -7,12 +7,53 @@ namespace details
 struct log_msg
 {
     log_msg() = default;
-    log_msg(level::level_enum l):msg_level(l) {};    
-    
-    bufpair_t msg_buf;
-    log_clock::time_point msg_time;
+    log_msg(level::level_enum l):
+		msg_level(l),
+		msg_time(),
+		msg_header_size(0),
+		str() {}
+
+
+	log_msg(const log_msg& other):
+		msg_level(other.msg_level),
+		msg_time(other.msg_time),
+		msg_header_size(other.msg_header_size),
+		str(other.str) {}
+
+	log_msg(log_msg&& other):log_msg()
+	{
+		swap(*this, other);
+	}
+
+	friend void swap(log_msg& l, log_msg& r)
+	{
+		using std::swap;
+		swap(l.msg_level, r.msg_level);
+		swap(l.msg_time, r.msg_time);
+		swap(l.msg_header_size, r.msg_header_size);
+		swap(l.str, r.str);
+	}
+
+
+
+	log_msg& operator=(log_msg other)
+	{
+		swap(*this, other);
+		return *this;
+	}
+
+
+	void clear()
+	{
+		msg_header_size = 0;
+		str.clear();		
+	}
+
+    level::level_enum msg_level;	
+	log_clock::time_point msg_time;
     std::size_t msg_header_size;
-    level::level_enum msg_level;
+	std::string str;
+
 };
 }
 }
diff --git a/include/c11log/details/stack_buf.h b/include/c11log/details/stack_buf.h
deleted file mode 100644
index bfe9d619..00000000
--- a/include/c11log/details/stack_buf.h
+++ /dev/null
@@ -1,110 +0,0 @@
-#pragma once
-
-#include <array>
-#include <vector>
-#include <algorithm>
-#include <cstring>
-
-// Fast memory storage
-// stores its contents on the stack when possible, in vector<char> otherwise
-// NOTE: User should be remember that returned buffer might be on the stack!!
-namespace c11log
-{
-namespace details
-{
-
-template<std::size_t STACK_SIZE=128>
-class stack_buf
-{
-public:
-    stack_buf():_v(),_stack_buf(), _stack_size(0) {}
-    ~stack_buf() {};
-
-	stack_buf& operator=(const stack_buf other) = delete;
-    stack_buf& operator=(stack_buf&& other) = delete;
-
-    stack_buf(const bufpair_t& buf_to_copy):stack_buf()
-    {
-        append(buf_to_copy);
-    }
-
-    stack_buf(const stack_buf& other)
-    {
-        _stack_size = other._stack_size;
-        if(!other._v.empty())
-            _v = other._v;
-        else if(_stack_size)
-            std::copy(other._stack_buf.begin(), other._stack_buf.begin()+_stack_size, _stack_buf.begin());
-    }
-
-    stack_buf(stack_buf&& other)
-    {	
-        _stack_size = other._stack_size;
-        if(!other._v.empty())
-            _v = std::move(other._v);
-        else if(_stack_size)
-            std::copy(other._stack_buf.begin(), other._stack_buf.begin()+_stack_size, _stack_buf.begin());
-		other.clear();
-    }
-    
-    void append(const char* buf, std::size_t buf_size)
-    {
-        //If we are aleady using _v, forget about the stack
-        if(!_v.empty())
-        {
-            _v.insert(_v.end(), buf, buf+ buf_size);
-        }
-        //Try use the stack
-        else
-        {
-            if(_stack_size+buf_size <= STACK_SIZE)
-            {
-                std::memcpy(&_stack_buf[_stack_size], buf, buf_size);
-                _stack_size+=buf_size;
-            }
-            //Not enough stack space. Copy all to _v
-            else
-            {
-                _v.reserve(_stack_size+buf_size);
-                if(_stack_size)
-                    _v.insert(_v.end(), _stack_buf.begin(), _stack_buf.begin() +_stack_size);
-                _v.insert(_v.end(), buf, buf+buf_size);
-            }
-        }
-    }
-
-    void append(const bufpair_t &buf)
-    {
-        append(buf.first, buf.second);
-    }
-
-    void clear()
-    {
-        _stack_size = 0;
-        _v.clear();
-    }
-
-    bufpair_t get() const
-    {
-        if(!_v.empty())
-            return bufpair_t(_v.data(), _v.size());
-        else
-            return bufpair_t(_stack_buf.data(), _stack_size);
-    }
-
-    std::size_t size() const
-    {
-        if(!_v.empty())
-            return _v.size();
-        else
-            return _stack_size;
-    }
-
-private:
-    std::vector<char> _v;
-    std::array<char, STACK_SIZE> _stack_buf;
-    std::size_t _stack_size;
-};
-
-}
-} //namespace c11log { namespace details {
diff --git a/include/c11log/details/stack_oss.h b/include/c11log/details/stack_oss.h
deleted file mode 100644
index ffdb07f5..00000000
--- a/include/c11log/details/stack_oss.h
+++ /dev/null
@@ -1,101 +0,0 @@
-#pragma once
-
-// Faster than ostringstream--returns its string by ref
-#include <ostream>
-#include "c11log/details/stack_buf.h"
-
-namespace c11log
-{
-namespace details
-{
-
-class stack_devicebuf:public std::streambuf
-{
-public:
-    using Base = std::streambuf;
-    stack_devicebuf() = default;
-    ~stack_devicebuf() = default;
-
-	stack_devicebuf& operator=(const stack_devicebuf&) = delete;
-
-    stack_devicebuf(const stack_devicebuf& other):std::basic_streambuf<char>(),_stackbuf(other._stackbuf)
-	{}
-
-	stack_devicebuf(stack_devicebuf&& other):std::basic_streambuf<char>(),_stackbuf(std::move(other._stackbuf))
-	{
-		other.clear();
-	}
-
-    bufpair_t buf() const
-    {
-        return _stackbuf.get();
-    }
-
-    std::size_t size() const
-    {
-        return _stackbuf.size();
-    }
-
-    void clear()
-    {
-        _stackbuf.clear();
-    }
-
-protected:
-    // copy the give buffer into the accumulated fast buffer
-    std::streamsize xsputn(const char_type* s, std::streamsize count) override
-    {
-        _stackbuf.append(s, static_cast<unsigned int>(count));
-        return count;
-    }
-
-    int_type overflow(int_type ch) override
-    {
-        if (traits_type::not_eof(ch))
-        {
-            char c = traits_type::to_char_type(ch);
-            xsputn(&c, 1);
-        }
-        return ch;
-    }
-private:
-    stack_buf<192> _stackbuf;
-};
-
-class stack_oss:public std::ostream
-{
-public:
-    stack_oss():std::ostream(&_dev) {}
-    ~stack_oss() = default;
-
-	stack_oss& operator=(const stack_oss& other) = delete;
-	stack_oss& operator=(const stack_oss&& other) = delete;
-
-    stack_oss(const stack_oss& other):std::basic_ios<char>(), std::ostream(&_dev), _dev(other._dev)
-	{}
-
-    stack_oss(stack_oss&& other):std::basic_ios<char>(), std::ostream(&_dev), _dev(std::move(other._dev))
-	{
-		other.clear();
-	}
-
-    bufpair_t buf() const
-    {
-        return _dev.buf();
-    }
-
-    std::size_t size() const
-    {
-        return _dev.size();
-    }
-
-    void clear()
-    {
-        _dev.clear();
-    }
-
-private:
-    stack_devicebuf _dev;
-};
-}
-}
diff --git a/include/c11log/formatter.h b/include/c11log/formatter.h
index 9f431850..7bc76395 100644
--- a/include/c11log/formatter.h
+++ b/include/c11log/formatter.h
@@ -7,10 +7,10 @@
 #include <iomanip>
 #include <thread>
 #include <cstring>
-
+#include <sstream>
 #include "common_types.h"
 #include "details/os.h"
-#include "details/stack_oss.h"
+
 
 namespace c11log
 {
@@ -57,8 +57,7 @@ inline void c11log::formatters::default_formatter::_format_time(const log_clock:
     __declspec(thread) static size_t s_cache_size;
     __declspec(thread) static std::time_t s_cache_time_t = 0;
 #else
-    thread_local static char s_cache_str[64];
-    thread_local static size_t s_cache_size;
+    thread_local static std::string s_cache_timestr;
     thread_local static std::time_t s_cache_time_t = 0;
 #endif
 
@@ -67,7 +66,7 @@ inline void c11log::formatters::default_formatter::_format_time(const log_clock:
     if(tp_time_t != s_cache_time_t)
     {
         auto tm_now = details::os::localtime(tp_time_t);
-        details::stack_oss time_oss;
+        std::ostringstream time_oss;
         time_oss.fill('0');
         time_oss << '[' << tm_now.tm_year + 1900 << '-';
         time_oss.width(2);
@@ -82,10 +81,10 @@ inline void c11log::formatters::default_formatter::_format_time(const log_clock:
         time_oss << tm_now.tm_sec << ']';
         //Cache the resulted string and its size
         s_cache_time_t = tp_time_t;
-        //const std::string &s = time_oss.str_ref();
-        bufpair_t buf = time_oss.buf();
-        std::memcpy(s_cache_str, buf.first, buf.second);
-        s_cache_size = buf.second;
+        //const std::string &s = time_oss.str_ref();        
+		s_cache_timestr = time_oss.str();
+
+
     }
-    output.write(s_cache_str, s_cache_size);
+    output << s_cache_timestr;
 }
diff --git a/include/c11log/logger.h b/include/c11log/logger.h
index 765b4e5b..62e8390c 100644
--- a/include/c11log/logger.h
+++ b/include/c11log/logger.h
@@ -6,7 +6,7 @@
 #include<memory>
 #include<mutex>
 #include<atomic>
-
+#include <sstream>
 #include "common_types.h"
 #include "sinks/base_sink.h"
 #include "details/factory.h"
@@ -27,10 +27,11 @@ class logger
 {
 public:
 
-    using sink_ptr = std::shared_ptr<sinks::base_sink>;
-    using formatter_ptr = std::shared_ptr<c11log::formatters::formatter>;
+    using sink_ptr = std::shared_ptr<sinks::base_sink>;    
     using sinks_vector_t = std::vector<sink_ptr>;
-    using sinks_init_list = std::initializer_list<sink_ptr>;
+	using sinks_init_list = std::initializer_list<sink_ptr>;
+
+	using formatter_ptr = std::shared_ptr<c11log::formatters::formatter>;
 
     logger(const std::string& name, sinks_init_list, formatter_ptr = nullptr);
     logger(const std::string& name, sink_ptr, formatter_ptr = nullptr);
diff --git a/include/c11log/sinks/async_sink.h b/include/c11log/sinks/async_sink.h
index 4bd22d38..e3553520 100644
--- a/include/c11log/sinks/async_sink.h
+++ b/include/c11log/sinks/async_sink.h
@@ -3,7 +3,7 @@
 #include <thread>
 #include <chrono>
 #include <atomic>
-#include <functional>
+#include <algorithm>
 
 #include "base_sink.h"
 #include "../logger.h"
@@ -18,27 +18,19 @@ namespace sinks
 {
 
 
-static void msg_deleter(details::log_msg* msg_to_delete)
-{
-    delete []msg_to_delete->msg_buf.first;
-    delete msg_to_delete;
-}
-
 class async_sink : public base_sink
 {
 public:
+    using q_type = details::blocking_queue<details::log_msg>;
 
-
-    using queue_type = details::blocking_queue<std::unique_ptr<details::log_msg, std::function<void(details::log_msg*)>>>;
-
-    explicit async_sink(const queue_type::size_type max_queue_size);
+    explicit async_sink(const q_type::size_type max_queue_size);
 
     //Stop logging and join the back thread
     // TODO: limit with timeout of the join and kill it afterwards?
     ~async_sink();
     void add_sink(logger::sink_ptr sink);
     void remove_sink(logger::sink_ptr sink_ptr);
-    queue_type& q();
+    q_type& q();
     //Wait to remaining items (if any) in the queue to be written and shutdown
     void shutdown(const std::chrono::milliseconds& timeout);
 
@@ -50,7 +42,7 @@ protected:
 private:
     c11log::logger::sinks_vector_t _sinks;
     std::atomic<bool> _active;
-    queue_type _q;
+    q_type _q;
     std::thread _back_thread;
     //Clear all remaining messages(if any), stop the _back_thread and join it
     void _shutdown();
@@ -63,7 +55,7 @@ private:
 // async_sink class implementation
 ///////////////////////////////////////////////////////////////////////////////
 
-inline c11log::sinks::async_sink::async_sink(const queue_type::size_type max_queue_size)
+inline c11log::sinks::async_sink::async_sink(const q_type::size_type max_queue_size)
     :_sinks(),
      _active(true),
      _q(max_queue_size),
@@ -77,19 +69,10 @@ inline c11log::sinks::async_sink::~async_sink()
 
 
 inline void c11log::sinks::async_sink::_sink_it(const details::log_msg& msg)
-{
-    auto msg_size = msg.msg_buf.second;
-    if(!_active || !msg_size)
+{    
+    if(!_active || msg.str.empty())
         return;
-    //re allocate on the heap the (stack based) message
-    details::log_msg* new_msg = new details::log_msg(msg);
-
-    char *buf = new char[msg_size];
-    std::memcpy(buf, msg.msg_buf.first, msg_size);
-    new_msg->msg_buf = bufpair_t(buf, msg_size);
-    // Create unique_ptr with custom deleter and push it
-    queue_type::item_type new_shared_msg(new_msg, msg_deleter);
-    _q.push(std::move(new_shared_msg));
+    _q.push(msg);
 }
 
 inline void c11log::sinks::async_sink::_thread_loop()
@@ -97,12 +80,12 @@ inline void c11log::sinks::async_sink::_thread_loop()
     static std::chrono::seconds  pop_timeout { 1 };
     while (_active)
     {
-        queue_type::item_type msg;
+        q_type::item_type msg;
         if (_q.pop(msg, pop_timeout))
         {
             for (auto &sink : _sinks)
             {
-                sink->log(*msg);
+                sink->log(msg);
                 if(!_active)
                     break;
             }
@@ -115,12 +98,12 @@ inline void c11log::sinks::async_sink::add_sink(logger::sink_ptr sink)
     _sinks.push_back(sink);
 }
 
-inline void c11log::sinks::async_sink::remove_sink(logger::sink_ptr sink_ptr)
+inline void c11log::sinks::async_sink::remove_sink(logger::sink_ptr sink)
 {
-    _sinks.erase(std::remove(_sinks.begin(), _sinks.end(), sink_ptr), _sinks.end());
+    _sinks.erase(std::remove(_sinks.begin(), _sinks.end(), sink), _sinks.end());
 }
 
-inline c11log::sinks::async_sink::queue_type& c11log::sinks::async_sink::q()
+inline c11log::sinks::async_sink::q_type& c11log::sinks::async_sink::q()
 {
     return _q;
 }
diff --git a/include/c11log/sinks/console_sinks.h b/include/c11log/sinks/console_sinks.h
index 4d28268b..6adb9759 100644
--- a/include/c11log/sinks/console_sinks.h
+++ b/include/c11log/sinks/console_sinks.h
@@ -23,7 +23,7 @@ protected:
     virtual void _sink_it(const details::log_msg& msg) override
     {
         std::lock_guard<std::mutex> lock(_mutex);
-        _ostream.write(msg.msg_buf.first, msg.msg_buf.second);
+        _ostream << msg.str;
     }
 
     std::ostream& _ostream;
diff --git a/include/c11log/sinks/file_sinks.h b/include/c11log/sinks/file_sinks.h
index 0b345321..a82f841d 100644
--- a/include/c11log/sinks/file_sinks.h
+++ b/include/c11log/sinks/file_sinks.h
@@ -31,7 +31,7 @@ protected:
     void _sink_it(const details::log_msg& msg) override
     {
         std::lock_guard<std::mutex> lock(_mutex);
-        _flush_helper.write(msg.msg_buf, _ofstream);
+        _flush_helper.write(msg.str, _ofstream);
     }
 private:
     std::mutex _mutex;
@@ -65,13 +65,13 @@ protected:
     {
         std::lock_guard<std::mutex> lock(_mutex);
 
-        _current_size += msg.msg_buf.second;
+        _current_size += msg.str.size();
         if (_current_size  > _max_size)
         {
             _rotate();
-            _current_size = msg.msg_buf.second;
+            _current_size = msg.str.size();
         }
-        _flush_helper.write(msg.msg_buf, _ofstream);
+        _flush_helper.write(msg.str, _ofstream);
     }
 
 
@@ -144,7 +144,7 @@ protected:
             _ofstream.open(_calc_filename(_base_filename, _extension));
             _midnight_tp = _calc_midnight_tp();
         }
-        _flush_helper.write(msg.msg_buf, _ofstream);
+        _flush_helper.write(msg.str, _ofstream);
     }
 
 private: