diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c62a7cf..0c6dacc6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ Version 51
 * Fix file_body::get() not setting the more flag correctly
 * Use BOOST_FALLTHROUGH
 * Use BOOST_STRINGIZE
+* DynamicBuffer benchmarks
 
 API Changes:
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 02fb33ea..6bd5c950 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -111,28 +111,16 @@ endfunction()
 
 if ("${VARIANT}" STREQUAL "coverage")
     set(CMAKE_CXX_FLAGS
-      "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
-    set(CMAKE_BUILD_TYPE RELWITHDEBINFO)
+      "${CMAKE_CXX_FLAGS} -DBEAST_NO_BUFFER_BENCH=1 -fprofile-arcs -ftest-coverage")
+    set (CMAKE_BUILD_TYPE RELWITHDEBINFO)
     set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lgcov")
 
 elseif ("${VARIANT}" STREQUAL "ubasan")
     set(CMAKE_CXX_FLAGS
-      "${CMAKE_CXX_FLAGS} -funsigned-char -fno-omit-frame-pointer -fsanitize=address,undefined -fsanitize-blacklist=${PROJECT_SOURCE_DIR}/scripts/blacklist.supp")
+      "${CMAKE_CXX_FLAGS} -DBEAST_NO_BUFFER_BENCH=1 -funsigned-char -fno-omit-frame-pointer -fsanitize=address,undefined -fsanitize-blacklist=${PROJECT_SOURCE_DIR}/scripts/blacklist.supp")
     set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address,undefined")
     set(CMAKE_BUILD_TYPE RELWITHDEBINFO)
 
-elseif ("${VARIANT}" STREQUAL "asan")
-    set(CMAKE_CXX_FLAGS
-      "${CMAKE_CXX_FLAGS} -funsigned-char -fsanitize=address -fno-omit-frame-pointer")
-    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address")
-    set(CMAKE_BUILD_TYPE RELWITHDEBINFO)
-
-elseif ("${VARIANT}" STREQUAL "usan")
-    set(CMAKE_CXX_FLAGS
-      "${CMAKE_CXX_FLAGS} -fsanitize=undefined -fsanitize-blacklist=${PROJECT_SOURCE_DIR}/scripts/blacklist.supp -fno-omit-frame-pointer")
-    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=undefined")
-    set(CMAKE_BUILD_TYPE RELWITHDEBINFO)
-
 elseif ("${VARIANT}" STREQUAL "debug")
     set(CMAKE_BUILD_TYPE DEBUG)
 
diff --git a/Jamroot b/Jamroot
index f3234aef..d3c513e3 100644
--- a/Jamroot
+++ b/Jamroot
@@ -54,9 +54,9 @@ if [ os.name ] = MACOSX
 
 variant coverage
   :
-    debug
+    release
   :
-    <cxxflags>"-fprofile-arcs -ftest-coverage"
+    <cxxflags>"-DBEAST_NO_BUFFER_BENCH=1 -fprofile-arcs -ftest-coverage"
     <linkflags>"-lgcov"
   ;
 
@@ -64,34 +64,10 @@ variant ubasan
   :
     release
   :
-    <cxxflags>"-funsigned-char -fno-omit-frame-pointer -fsanitize=address,undefined -fsanitize-blacklist=scripts/blacklist.supp"
+    <cxxflags>"-DBEAST_NO_BUFFER_BENCH=1 -funsigned-char -fno-omit-frame-pointer -fsanitize=address,undefined -fsanitize-blacklist=scripts/blacklist.supp"
     <linkflags>"-fsanitize=address,undefined"
   ;
 
-variant asan
-  :
-    release
-  :
-    <cxxflags>"-funsigned-char -fsanitize=address -fno-omit-frame-pointer"
-    <linkflags>"-fsanitize=address"
-  ;
-
-variant msan
-  :
-    debug
-  :
-    <cxxflags>"-fsanitize=memory -fsanitize-memory-track-origins=2 -fsanitize-memory-use-after-dtor -fno-omit-frame-pointer"
-    <linkflags>"-fsanitize=memory"
-  ;
-
-variant usan
-  :
-    debug
-  :
-    <cxxflags>"-fsanitize=undefined -fsanitize-blacklist=scripts/blacklist.supp -fno-omit-frame-pointer"
-    <linkflags>"-fsanitize=undefined"
-  ;
-
 project beast
   : requirements
     <include>.
diff --git a/test/Jamfile b/test/Jamfile
index a669bab2..9136c85b 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -18,6 +18,7 @@ unit-test core-tests :
     ../extras/beast/unit_test/main.cpp
     core/async_result.cpp
     core/bind_handler.cpp
+    core/buffer_bench.cpp
     core/buffer_cat.cpp
     core/buffer_prefix.cpp
     core/buffered_read_stream.cpp
diff --git a/test/core/CMakeLists.txt b/test/core/CMakeLists.txt
index 9b012af0..76bc6c22 100644
--- a/test/core/CMakeLists.txt
+++ b/test/core/CMakeLists.txt
@@ -10,6 +10,7 @@ add_executable (core-tests
     ../../extras/beast/unit_test/main.cpp
     async_result.cpp
     bind_handler.cpp
+    buffer_bench.cpp
     buffer_cat.cpp
     buffer_prefix.cpp
     buffer_test.hpp
diff --git a/test/core/buffer_bench.cpp b/test/core/buffer_bench.cpp
new file mode 100644
index 00000000..aaa31068
--- /dev/null
+++ b/test/core/buffer_bench.cpp
@@ -0,0 +1,241 @@
+//
+// Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <beast/core/flat_buffer.hpp>
+#include <beast/core/multi_buffer.hpp>
+#include <beast/core/string_view.hpp>
+#include <beast/core/detail/read_size_helper.hpp>
+#include <beast/unit_test/suite.hpp>
+#include <boost/asio/streambuf.hpp>
+#include <algorithm>
+#include <chrono>
+#include <cstdlib>
+#include <iomanip>
+#include <utility>
+#include <vector>
+
+namespace beast {
+
+class buffer_bench_test : public beast::unit_test::suite
+{
+public:
+    using size_type = std::uint64_t;
+
+    class timer
+    {
+        using clock_type =
+            std::chrono::system_clock;
+
+        clock_type::time_point when_;
+
+    public:
+        using duration =
+            clock_type::duration;
+
+        timer()
+            : when_(clock_type::now())
+        {
+        }
+
+        duration
+        elapsed() const
+        {
+            return clock_type::now() - when_;
+        }
+    };
+
+    inline
+    size_type
+    throughput(std::chrono::duration<
+        double> const& elapsed, std::size_t items)
+    {
+        using namespace std::chrono;
+        return static_cast<size_type>(
+            1 / (elapsed/items).count());
+    }
+
+    template<class MutableBufferSequence>
+    static
+    std::size_t
+    fill(MutableBufferSequence const& buffers)
+    {
+        std::size_t n = 0;
+        using boost::asio::buffer_cast;
+        using boost::asio::buffer_size;
+        for(auto const& buffer : buffers)
+        {
+            std::fill(
+                buffer_cast<char*>(buffer),
+                buffer_cast<char*>(buffer) +
+                    buffer_size(buffer), 0);
+            n += buffer_size(buffer);
+        }
+        return n;
+    }
+
+    template<class DynamicBuffer>
+    size_type
+    do_prepares(std::size_t repeat,
+        std::size_t count, std::size_t size)
+    {
+        timer t;
+        size_type total = 0;
+        for(auto i = repeat; i--;)
+        {
+            DynamicBuffer b;
+            for(auto j = count; j--;)
+            {
+                auto const n = fill(b.prepare(size));
+                b.commit(n);
+                total += n;
+            }
+        }
+        return throughput(t.elapsed(), total);
+    }
+
+    template<class DynamicBuffer>
+    size_type
+    do_hints(std::size_t repeat,
+        std::size_t count, std::size_t size)
+    {
+        timer t;
+        size_type total = 0;
+        for(auto i = repeat; i--;)
+        {
+            DynamicBuffer b;
+            for(auto j = count; j--;)
+            {
+                for(auto remain = size; remain;)
+                {
+                    using beast::detail::read_size_helper;
+                    auto const n = fill(b.prepare(
+                        read_size_helper(b, remain)));
+                    b.commit(n);
+                    remain -= n;
+                    total += n;
+                }
+            }
+        }
+        return throughput(t.elapsed(), total);
+    }
+
+    template<class DynamicBuffer>
+    size_type
+    do_random(std::size_t repeat,
+        std::size_t count, std::size_t size)
+    {
+        timer t;
+        size_type total = 0;
+        for(auto i = repeat; i--;)
+        {
+            DynamicBuffer b;
+            for(auto j = count; j--;)
+            {
+                auto const n = fill(b.prepare(
+                    1 + (rand()%(2*size))));
+                b.commit(n);
+                total += n;
+            }
+        }
+        return throughput(t.elapsed(), total);
+    }
+
+    static
+    inline
+    void
+    do_trials_1(bool)
+    {
+    }
+
+    template<class F0, class... FN>
+    void
+    do_trials_1(bool print, F0&& f, FN... fn)
+    {
+        timer t;
+        using namespace std::chrono;
+        static size_type constexpr den = 1024 * 1024;
+        if(print)
+        {
+            log << std::right << std::setw(10) <<
+                ((f() + (den / 2)) / den) << " MB/s";
+            log.flush();
+        }
+        else
+        {
+            f();
+        }
+        do_trials_1(print, fn...);
+    }
+
+    template<class F0, class... FN>
+    void
+    do_trials(string_view name,
+        std::size_t trials, F0&& f0, FN... fn)
+    {
+        using namespace std::chrono;
+        // warm-up
+        do_trials_1(false, f0, fn...);
+        do_trials_1(false, f0, fn...);
+        while(trials--)
+        {
+            timer t;
+            log << std::left << std::setw(24) << name << ":";
+            log.flush();
+            do_trials_1(true, f0, fn...);
+            log << "   " <<
+                duration_cast<milliseconds>(t.elapsed()).count() << "ms";
+            log << std::endl;
+        }
+    }
+
+    void
+    run() override
+    {
+        static std::size_t constexpr trials = 1;
+        static std::size_t constexpr repeat = 250;
+        std::vector<std::pair<std::size_t, std::size_t>> params;
+        params.emplace_back(1024, 1024);
+        params.emplace_back(512, 4096);
+        params.emplace_back(256, 32768);
+        log << std::endl;
+        for(auto const& param : params)
+        {
+            auto const count = param.first;
+            auto const size = param.second;
+            auto const s = std::string("count=") + std::to_string(count) +
+                ", size=" + std::to_string(size);
+            log << std::left << std::setw(24) << s << " " <<
+                std::right << std::setw(15) << "prepare" <<
+                std::right << std::setw(15) << "with hint" <<
+                std::right << std::setw(15) << "random" <<
+                std::endl;
+            do_trials("multi_buffer", trials,
+                 [&](){ return do_prepares<multi_buffer>(repeat, count, size); }
+                ,[&](){ return do_hints   <multi_buffer>(repeat, count, size); }
+                ,[&](){ return do_random  <multi_buffer>(repeat, count, size); }
+            );
+            do_trials("flat_buffer", trials,
+                 [&](){ return do_prepares<flat_buffer>(repeat, count, size); }
+                ,[&](){ return do_hints   <flat_buffer>(repeat, count, size); }
+                ,[&](){ return do_random  <flat_buffer>(repeat, count, size); }
+            );
+            do_trials("boost::asio::streambuf", trials,
+                 [&](){ return do_prepares<boost::asio::streambuf>(repeat, count, size); }
+                ,[&](){ return do_hints   <boost::asio::streambuf>(repeat, count, size); }
+                ,[&](){ return do_random  <boost::asio::streambuf>(repeat, count, size); }
+            );
+            log << std::endl;
+        }
+        pass();
+    }
+};
+
+#if defined(NDEBUG) && ! BEAST_NO_BUFFER_BENCH
+BEAST_DEFINE_TESTSUITE(buffer_bench,core,beast);
+#endif
+
+} // beast