diff --git a/bench/Makefile b/bench/Makefile
index 24a4d7b0..98fcccb7 100644
--- a/bench/Makefile
+++ b/bench/Makefile
@@ -1,18 +1,15 @@
-CXX	?= g++
+CXX	= g++
 CXXFLAGS	= -march=native -Wall -Wextra -pedantic -std=c++11 -pthread -I../include
-CXX_RELEASE_FLAGS = -O3 -flto -DNDEBUG
+CXX_RELEASE_FLAGS = -O3 -flto
 
 
-binaries=bench spdlog-null-async
+binaries=bench
 
 all: $(binaries)
 
 bench: bench.cpp
 	$(CXX) bench.cpp -o bench $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
-	
-spdlog-null-async: spdlog-null-async.cpp
-	$(CXX) spdlog-null-async.cpp -o spdlog-null-async $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
-			
+				
 
 .PHONY: clean
 
diff --git a/bench/bench.cpp b/bench/bench.cpp
index 68cdd9be..52e2ffaf 100644
--- a/bench/bench.cpp
+++ b/bench/bench.cpp
@@ -32,7 +32,7 @@ void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count
 int main(int argc, char *argv[])
 {
 
-    int queue_size = 1048576;
+    int queue_size = 1000000;
     int howmany = 1000000;
     int threads = 10;
     int file_size = 30 * 1024 * 1024;
diff --git a/bench/spdlog-null-async.cpp b/bench/spdlog-null-async.cpp
deleted file mode 100644
index ee64eb92..00000000
--- a/bench/spdlog-null-async.cpp
+++ /dev/null
@@ -1,116 +0,0 @@
-//
-// Copyright(c) 2015 Gabi Melman.
-// Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-
-//
-// bench.cpp : spdlog benchmarks
-//
-#include "spdlog/async.h"
-#include "spdlog/async_logger.h"
-#include "spdlog/sinks/null_sink.h"
-#include "spdlog/spdlog.h"
-#include "utils.h"
-#include <atomic>
-#include <cstdlib> // EXIT_FAILURE
-#include <iostream>
-#include <memory>
-#include <string>
-#include <thread>
-
-using namespace std;
-using namespace std::chrono;
-using namespace spdlog;
-using namespace spdlog::sinks;
-using namespace utils;
-
-size_t bench_as(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count);
-
-int main(int argc, char *argv[])
-{
-
-    int howmany;
-    int tp_queue_size;
-    int tp_threads = 1;
-    int client_threads = 10;
-    int iters = 10;
-
-    try
-    {
-        if (argc < 2)
-        {
-            cout << "Usage: " << argv[0] << " <howmany> [client_threads] [q_size] [tp_threads]" << endl;
-            return (1);
-        }
-
-        howmany = atoi(argv[1]);
-        if (argc > 2)
-            client_threads = atoi(argv[2]);
-
-        if (argc > 3)
-            tp_queue_size = atoi(argv[3]);
-        else
-            tp_queue_size = howmany;
-
-        if (argc > 4)
-            tp_threads = atoi(argv[4]);
-
-        cout << "\n*******************************************************************************\n";
-        cout << "messages:\t" << format(howmany) << endl;
-        cout << "client_threads:\t" << client_threads << endl;
-        cout << "tp queue:\t" << format(tp_queue_size) << endl;
-        cout << "tp threads:\t" << tp_threads << endl;
-        cout << "*******************************************************************************\n";
-
-        size_t total_rate = 0;
-
-        for (int i = 0; i < iters; ++i)
-        {
-            spdlog::init_thread_pool(tp_queue_size, tp_threads);
-            auto as = spdlog::create_async_logger<null_sink_mt>("async(null-sink)");
-            total_rate += bench_as(howmany, as, client_threads);
-            spdlog::drop("async(null-sink)");
-        }
-        std::cout << endl;
-        std::cout << "Avg rate: " << format(total_rate / iters) << "/sec" << std::endl;
-    }
-    catch (std::exception &ex)
-    {
-        std::cerr << "Error: " << ex.what() << std::endl;
-        perror("Last error");
-        return EXIT_FAILURE;
-    }
-    return EXIT_SUCCESS;
-}
-
-// return rate/sec
-size_t bench_as(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count)
-{
-    cout << log->name() << "...\t\t" << flush;
-    std::atomic<int> msg_counter{0};
-    vector<thread> threads;
-    auto start = system_clock::now();
-    for (int t = 0; t < thread_count; ++t)
-    {
-        threads.push_back(std::thread([&]() {
-            for (;;)
-            {
-                int counter = ++msg_counter;
-                if (counter > howmany)
-                    break;
-                log->info("Hello logger: msg number {}", counter);
-            }
-        }));
-    }
-
-    for (auto &t : threads)
-    {
-        t.join();
-    }
-
-    auto delta = system_clock::now() - start;
-    auto delta_d = duration_cast<duration<double>>(delta).count();
-    auto per_sec = size_t(howmany / delta_d);
-    cout << format(per_sec) << "/sec" << endl;
-    return per_sec;
-}