diff --git a/3rdparty/3rdparty.cmake b/3rdparty/3rdparty.cmake
index 53694ce380..614980a30e 100644
--- a/3rdparty/3rdparty.cmake
+++ b/3rdparty/3rdparty.cmake
@@ -21,11 +21,14 @@ endfunction()
 include(3rdparty/dspfilters.cmake)
 include(3rdparty/eigen.cmake)
 include(3rdparty/gamma.cmake)
+include(3rdparty/sndfile.cmake)
+include(3rdparty/xtensor.cmake)
+include(3rdparty/r8brain.cmake)
+
+if(NOT EMSCRIPTEN)
 include(3rdparty/libsimpleio.cmake)
 include(3rdparty/mimalloc.cmake)
-include(3rdparty/r8brain.cmake)
 include(3rdparty/sh4lt.cmake)
 include(3rdparty/shmdata.cmake)
 include(3rdparty/snappy.cmake)
-include(3rdparty/sndfile.cmake)
-include(3rdparty/xtensor.cmake)
+endif()
diff --git a/3rdparty/libossia b/3rdparty/libossia
index 6b2e3b1b92..dd24e1832e 160000
--- a/3rdparty/libossia
+++ b/3rdparty/libossia
@@ -1 +1 @@
-Subproject commit 6b2e3b1b9279a306b3faf933989d1e7af1dc47cf
+Subproject commit dd24e1832ea951622ee6fda604a8c62244325790
diff --git a/cmake/Configurations/all-plugins.cmake b/cmake/Configurations/all-plugins.cmake
index fef720bcf1..e876b20b8d 100644
--- a/cmake/Configurations/all-plugins.cmake
+++ b/cmake/Configurations/all-plugins.cmake
@@ -26,7 +26,7 @@ if(CMAKE_SYSTEM_NAME MATCHES Emscripten)
 
   score-plugin-media
 
-#  score-plugin-gfx
+  score-plugin-gfx
   score-plugin-js
   score-plugin-midi
   score-plugin-recording
diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index c7d4466637..bde903cb1b 100755
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -21,10 +21,10 @@ if(CMAKE_SYSTEM_NAME MATCHES Emscripten)
   add_link_options("SHELL:-sSTACK_OVERFLOW_CHECK=0")
   #add_link_options("SHELL:--source-map-base http://127.0.0.1:8000/")
   add_link_options("SHELL:-sFETCH=1")
-  add_link_options("SHELL:-sWASM=1")
-  add_link_options("SHELL:-sFULL_ES2=1")
-  add_link_options("SHELL:-sFULL_ES3=1")
-  add_link_options("SHELL:-sUSE_WEBGL2=1")
+# OLD  add_link_options("SHELL:-sWASM=1")
+# OLD add_link_options("SHELL:-sFULL_ES2=1")
+# OLd add_link_options("SHELL:-sFULL_ES3=1")
+# OLD  add_link_options("SHELL:-sUSE_WEBGL2=1")
   #add_link_options("SHELL:-s EXIT_RUNTIME=1")
   add_link_options("SHELL:-sERROR_ON_UNDEFINED_SYMBOLS=1")
   #add_link_options("SHELL:-s PTHREAD_POOL_SIZE=16")
@@ -37,14 +37,19 @@ if(CMAKE_SYSTEM_NAME MATCHES Emscripten)
   #  add_link_options("SHELL:-s EXTRA_EXPORTED_RUNTIME_METHODS=[\"UTF16ToString\",\"stringToUTF16\"]")
 
   ## Qt 6
-  add_link_options("SHELL:-sUSE_PTHREADS=1")
+  add_link_options("-pthread")
+  add_compile_options("-fwasm-exceptions")
+  add_link_options("-fwasm-exceptions")
+  add_link_options("SHELL:-sJSPI")
+
+# OLD  add_link_options("SHELL:-sUSE_PTHREADS=1")
   # add_link_options("SHELL:-s FETCH=1")
   add_link_options("SHELL:-sWASM_BIGINT=1")
   add_link_options("SHELL:-sMODULARIZE=1")
-  add_link_options("SHELL:-sMAX_WEBGL_VERSION=2")
-  add_link_options("SHELL:-sWEBGL2_BACKWARDS_COMPATIBILITY_EMULATION=1")
+#  add_link_options("SHELL:-sMAX_WEBGL_VERSION=2")
+#  add_link_options("SHELL:-sWEBGL2_BACKWARDS_COMPATIBILITY_EMULATION=1")
   # add_link_options("SHELL:-pthread")
-  add_link_options("SHELL:-sASYNCIFY" "-s" "ASYNCIFY_IMPORTS=[qt_asyncify_suspend_js, qt_asyncify_resume_js]")
+#  add_link_options("SHELL:-sASYNCIFY" "-s" "ASYNCIFY_IMPORTS=[qt_asyncify_suspend_js, qt_asyncify_resume_js]")
 
   add_link_options("SHELL:-sABORTING_MALLOC=1")
   # add_link_options("SHELL:-sJS_MATH=1")
@@ -81,6 +86,7 @@ target_link_libraries(${APPNAME}
   PUBLIC
     score_lib_base
     ${QT_PREFIX}::CorePrivate
+    ${QT_PREFIX}::Gui
 )
 
 if(SCORE_STATIC_PLUGINS)
@@ -253,7 +259,12 @@ endif()
 include(ScoreDeployment)
 
 if(EMSCRIPTEN)
+  qt_import_plugins(${APPNAME}
+      INCLUDE Qt6::QWasmIntegrationPlugin
+      EXCLUDE Qt6::QMinimalIntegrationPlugin
+  )
   qt_finalize_executable(${APPNAME})
+  enable_minimal_qt_plugins(${APPNAME} 1)
 else()  
   disable_qt_plugins(${APPNAME})
   enable_minimal_qt_plugins(${APPNAME} 1)
diff --git a/src/plugins/score-plugin-audio/Audio/Settings/Model.cpp b/src/plugins/score-plugin-audio/Audio/Settings/Model.cpp
index 801df1827a..4cb36ac9bf 100644
--- a/src/plugins/score-plugin-audio/Audio/Settings/Model.cpp
+++ b/src/plugins/score-plugin-audio/Audio/Settings/Model.cpp
@@ -21,7 +21,7 @@ SETTINGS_PARAMETER_IMPL(Driver)
           "687d49cf-b58d-430f-8358-ec02cb50be36")} // PipeWire
 #elif defined(__EMSCRIPTEN__)
       Audio::AudioFactory::ConcreteKey{score::uuids::string_generator::compute(
-          "28b88e91-c5f0-4f13-834f-aa333d14aa81")} // SDL
+          "a2e8b688-521c-4755-b0b2-4e3d01807b8e")} // Web Audio (MiniAudio)
 #else
       Audio::AudioFactory::ConcreteKey
   {
diff --git a/src/plugins/score-plugin-audio/Audio/WASMMiniAudioInterface.hpp b/src/plugins/score-plugin-audio/Audio/WASMMiniAudioInterface.hpp
new file mode 100644
index 0000000000..c9f1948cbe
--- /dev/null
+++ b/src/plugins/score-plugin-audio/Audio/WASMMiniAudioInterface.hpp
@@ -0,0 +1,48 @@
+#pragma once
+#if defined(__EMSCRIPTEN__)
+#include <Audio/AudioInterface.hpp>
+#include <Audio/Settings/Model.hpp>
+
+#include <ossia/audio/miniaudio_protocol.hpp>
+
+#if OSSIA_ENABLE_MINIAUDIO
+
+namespace Audio
+{
+
+class WASMMiniAudioFactory final : public AudioFactory
+{
+  SCORE_CONCRETE("a2e8b688-521c-4755-b0b2-4e3d01807b8e")
+public:
+  ~WASMMiniAudioFactory() override { }
+  bool available() const noexcept override { return true; }
+  void
+  initialize(Audio::Settings::Model& set, const score::ApplicationContext& ctx) override
+  {
+  }
+
+  QString prettyName() const override { return QObject::tr("Web Audio (MiniAudio)"); }
+
+  std::shared_ptr<ossia::audio_engine> make_engine(
+      const Audio::Settings::Model& set, const score::ApplicationContext& ctx) override
+  {
+    auto context = std::make_shared<ossia::miniaudio_context>();
+    auto cfg = ma_context_config_init();
+    ma_context_init(nullptr, 0, &cfg, &context->context);
+
+    ma_device_id in_id{}, out_id{};
+    return std::make_shared<ossia::miniaudio_engine>(
+        std::move(context), "ossia score", in_id, out_id, 0, 2, 48000, 1024);
+  }
+
+  QWidget* make_settings(
+      Audio::Settings::Model& m, Audio::Settings::View& v,
+      score::SettingsCommandDispatcher& m_disp, QWidget* parent) override
+  {
+    return nullptr;
+  }
+};
+
+}
+#endif
+#endif
diff --git a/src/plugins/score-plugin-audio/CMakeLists.txt b/src/plugins/score-plugin-audio/CMakeLists.txt
index 0301fe9969..11ee0ae2b7 100644
--- a/src/plugins/score-plugin-audio/CMakeLists.txt
+++ b/src/plugins/score-plugin-audio/CMakeLists.txt
@@ -23,6 +23,7 @@ set(HDRS
     "${CMAKE_CURRENT_SOURCE_DIR}/Audio/PipeWireInterface.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/Audio/PortAudioInterface.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/Audio/SDLInterface.hpp"
+    "${CMAKE_CURRENT_SOURCE_DIR}/Audio/WASMMiniAudioInterface.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/Audio/WASAPIPortAudioInterface.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/Audio/WDMKSPortAudioInterface.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/Audio/AudioApplicationPlugin.hpp"
@@ -94,10 +95,14 @@ if(OSSIA_ENABLE_SDL)
   list(APPEND SCORE_FEATURES_LIST sdl)
 endif()
 
-if(LINUX OR BSD OR APPLE)
+if(LINUX OR BSD OR APPLE OR EMSCRIPTEN)
   target_include_directories(${PROJECT_NAME} SYSTEM PRIVATE "${OSSIA_3RDPARTY_FOLDER}/miniaudio")
   if(APPLE)
     target_link_libraries(${PROJECT_NAME} PRIVATE "-framework AudioUnit" "$<BUILD_INTERFACE:kfr>")
   endif()
+  if(EMSCRIPTEN)
+    target_compile_definitions(${PROJECT_NAME} PRIVATE MA_ENABLE_AUDIO_WORKLETS MA_ENABLE_WEBAUDIO)
+    target_link_options(${PROJECT_NAME} PUBLIC -sAUDIO_WORKLET=1 -sWASM_WORKERS=1)
+  endif()
 endif()
 setup_score_plugin(${PROJECT_NAME})
diff --git a/src/plugins/score-plugin-audio/score_plugin_audio.cpp b/src/plugins/score-plugin-audio/score_plugin_audio.cpp
index a82d948273..6354a8ed44 100644
--- a/src/plugins/score-plugin-audio/score_plugin_audio.cpp
+++ b/src/plugins/score-plugin-audio/score_plugin_audio.cpp
@@ -20,6 +20,7 @@
 #include <Audio/SDLInterface.hpp>
 #include <Audio/Settings/Factory.hpp>
 #include <Audio/WASAPIPortAudioInterface.hpp>
+#include <Audio/WASMMiniAudioInterface.hpp>
 #include <Audio/WDMKSPortAudioInterface.hpp>
 
 #include <score/plugins/FactorySetup.hpp>
@@ -220,6 +221,10 @@ std::vector<score::InterfaceBase*> score_plugin_audio::factories(
 #if defined(__APPLE__) && defined(OSSIA_AUDIO_MINIAUDIO)
          ,
          Audio::CoreAudioFactory
+#endif
+#if defined(__EMSCRIPTEN__) && defined(OSSIA_AUDIO_MINIAUDIO)
+         ,
+         Audio::WASMMiniAudioFactory
 #endif
          >>(vec, ctx, key);
 
diff --git a/src/plugins/score-plugin-gfx/Gfx/Graph/VideoNode.cpp b/src/plugins/score-plugin-gfx/Gfx/Graph/VideoNode.cpp
index 115419fd7f..4687a6bff7 100644
--- a/src/plugins/score-plugin-gfx/Gfx/Graph/VideoNode.cpp
+++ b/src/plugins/score-plugin-gfx/Gfx/Graph/VideoNode.cpp
@@ -439,4 +439,6 @@ AVFrame* VideoFrameReader::nextFrame(
 
 }
 
+#if !defined(__EMSCRIPTEN__)
 #include <hap/source/hap.c>
+#endif
\ No newline at end of file
diff --git a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.cpp b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.cpp
index a9ccc9b444..dc4bea93d0 100644
--- a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.cpp
+++ b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.cpp
@@ -3,6 +3,7 @@
 
 #include <cstring>
 
+#if !defined(__EMSCRIPTEN__)
 namespace score::gfx
 {
 
@@ -396,3 +397,4 @@ void DXVYCoCgDecoder::exec(RenderList&, QRhiResourceUpdateBatch& res, AVFrame& f
 }
 
 }
+#endif
diff --git a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.hpp b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.hpp
index 2827b532e7..edb7f7fd7b 100644
--- a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.hpp
+++ b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/DXV.hpp
@@ -1,6 +1,7 @@
 #pragma once
 #include <Gfx/Graph/decoders/GPUVideoDecoder.hpp>
 
+#if !defined(__EMSCRIPTEN__)
 extern "C" {
 #include <libavformat/avformat.h>
 #include <dxv.h>
@@ -81,3 +82,4 @@ struct DXVYCoCgDecoder : GPUVideoDecoder
 };
 
 }
+#endif
\ No newline at end of file
diff --git a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/GPUVideoDecoderFactory.cpp b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/GPUVideoDecoderFactory.cpp
index d393fcea1d..022f8bb1a6 100644
--- a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/GPUVideoDecoderFactory.cpp
+++ b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/GPUVideoDecoderFactory.cpp
@@ -267,6 +267,7 @@ std::unique_ptr<GPUVideoDecoder> createGPUVideoDecoder(
       // Try fourcc-based formats (HAP, DXV)
       std::string_view fourcc{(const char*)&format.pixel_format, 4};
 
+#if !defined(__EMSCRIPTEN__)
       if(fourcc == "Hap1")
         return std::make_unique<HAPDefaultDecoder>(
             QRhiTexture::BC1, format, f);
@@ -299,7 +300,7 @@ std::unique_ptr<GPUVideoDecoder> createGPUVideoDecoder(
         return std::make_unique<DXVYCoCgDecoder>(false, format, f);
       else if(fourcc == "DxvA")
         return std::make_unique<DXVYCoCgDecoder>(true, format, f);
-
+#endif
       return nullptr;
     }
   }
diff --git a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.cpp b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.cpp
index f33bf473ce..62d6f5d153 100644
--- a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.cpp
+++ b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.cpp
@@ -1,6 +1,7 @@
 
 #include <Gfx/Graph/decoders/HAP.hpp>
 
+#if !defined(__EMSCRIPTEN__)
 namespace score::gfx
 {
 HAPDecoder::HAPSection HAPDecoder::HAPSection::read(const uint8_t* bytes)
@@ -83,6 +84,7 @@ void HAPDecoder::setPixels_noEncoding(
 void HAPDecoder::setPixels_snappy(
     QRhiResourceUpdateBatch& res, const uint8_t* data_start, std::size_t size)
 {
+#if !defined(__EMSCRIPTEN__)
   size_t uncomp_size{};
   snappy::GetUncompressedLength((const char*)data_start, size, &uncomp_size);
 
@@ -97,6 +99,7 @@ void HAPDecoder::setPixels_snappy(
 
   auto y_tex = samplers[0].texture;
   res.uploadTexture(y_tex, desc);
+#endif
 }
 
 HAPDefaultDecoder::HAPDefaultDecoder(
@@ -221,3 +224,4 @@ void HAPMDecoder::setPixels(
 }
 
 }
+#endif
\ No newline at end of file
diff --git a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.hpp b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.hpp
index 7a6afad89f..960bb1815d 100644
--- a/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.hpp
+++ b/src/plugins/score-plugin-gfx/Gfx/Graph/decoders/HAP.hpp
@@ -3,6 +3,7 @@
 
 #include <hap/source/hap.h>
 
+#if !defined(__EMSCRIPTEN__)
 #include <snappy.h>
 
 extern "C" {
@@ -141,3 +142,5 @@ void main ()
 };
 
 }
+
+#endif
\ No newline at end of file
diff --git a/src/plugins/score-plugin-js/JS/Qml/QmlProcess.cpp b/src/plugins/score-plugin-js/JS/Qml/QmlProcess.cpp
index ac1f6128a1..fd063dbe54 100644
--- a/src/plugins/score-plugin-js/JS/Qml/QmlProcess.cpp
+++ b/src/plugins/score-plugin-js/JS/Qml/QmlProcess.cpp
@@ -1,5 +1,7 @@
 #include "QmlProcess.hpp"
 
+#if !defined(__EMSCRIPTEN__)
+
 #include <QTimer>
 
 #include <wobjectimpl.h>
@@ -174,3 +176,4 @@ void QmlProcess::setWorkingDirectory(const QString& dir)
   workingDirectoryChanged();
 }
 }
+#endif
diff --git a/src/plugins/score-plugin-js/JS/Qml/QmlProcess.hpp b/src/plugins/score-plugin-js/JS/Qml/QmlProcess.hpp
index a96c91cb4f..cbf918f606 100644
--- a/src/plugins/score-plugin-js/JS/Qml/QmlProcess.hpp
+++ b/src/plugins/score-plugin-js/JS/Qml/QmlProcess.hpp
@@ -2,6 +2,7 @@
 #include <QProcess>
 #include <QQmlEngine>
 
+#if !defined(__EMSCRIPTEN__)
 #include <verdigris>
 
 namespace JS
@@ -110,3 +111,4 @@ class QmlProcess : public QProcess
 W_REGISTER_ARGTYPE(QProcess::ProcessError)
 W_REGISTER_ARGTYPE(QProcess::ExitStatus)
 W_REGISTER_ARGTYPE(QProcess::ProcessState)
+#endif
\ No newline at end of file
diff --git a/src/plugins/score-plugin-js/score_plugin_js.cpp b/src/plugins/score-plugin-js/score_plugin_js.cpp
index 739a1f4209..f7259c5fd1 100644
--- a/src/plugins/score-plugin-js/score_plugin_js.cpp
+++ b/src/plugins/score-plugin-js/score_plugin_js.cpp
@@ -139,7 +139,9 @@ score_plugin_js::score_plugin_js()
   qmlRegisterType<JS::GlobalDeviceEnumerator>("Score.UI", 1, 0, "DeviceEnumerator");
   qmlRegisterType<JS::DeviceListener>("Score.UI", 1, 0, "DeviceListener");
 
+#if !defined(__EMSCRIPTEN__)
   qmlRegisterType<JS::QmlProcess>("Score.UI", 1, 0, "Process");
+#endif
 
   qRegisterMetaType<QVector<JS::MidiMessage>>();
 
diff --git a/src/plugins/score-plugin-media/CMakeLists.txt b/src/plugins/score-plugin-media/CMakeLists.txt
index 61182ba88c..196f777fc7 100644
--- a/src/plugins/score-plugin-media/CMakeLists.txt
+++ b/src/plugins/score-plugin-media/CMakeLists.txt
@@ -167,7 +167,6 @@ if(EMSCRIPTEN)
     /opt/ossia-sdk-wasm/ffmpeg/lib/libavutil.a
     /opt/ossia-sdk-wasm/ffmpeg/lib/libswscale.a
     /opt/ossia-sdk-wasm/ffmpeg/lib/libswresample.a
-    /opt/ossia-sdk-wasm/ffmpeg/lib/libpostproc.a
     -Wl,--end-group
   )
 elseif(TARGET avcodec)
diff --git a/src/plugins/score-plugin-scenario/Scenario/Document/ScenarioDocument/ScenarioDocumentView.cpp b/src/plugins/score-plugin-scenario/Scenario/Document/ScenarioDocument/ScenarioDocumentView.cpp
index 9e2d3b8fc6..3de9381914 100644
--- a/src/plugins/score-plugin-scenario/Scenario/Document/ScenarioDocument/ScenarioDocumentView.cpp
+++ b/src/plugins/score-plugin-scenario/Scenario/Document/ScenarioDocument/ScenarioDocumentView.cpp
@@ -59,6 +59,9 @@ namespace
 {
 static int defaultEditorRefreshRate()
 {
+#if defined(__EMSCRIPTEN__)
+  return 50; // ~20fps — WASM single-thread can't handle higher rates
+#else
   const auto tcount = QThread::idealThreadCount();
   if(tcount <= 4)
     return 30;
@@ -66,6 +69,7 @@ static int defaultEditorRefreshRate()
     return 16;
   else
     return 8;
+#endif
 }
 }
 ProcessGraphicsView::ProcessGraphicsView(
@@ -704,6 +708,10 @@ void ScenarioDocumentView::updateBackgroundMode()
     if(rate > 0)
       refreshRate = 1000. / rate;
   }
+#if defined(__EMSCRIPTEN__)
+  // Cap the refresh rate on WASM to avoid starving the single-threaded event loop
+  refreshRate = std::max(refreshRate, (double)defaultEditorRefreshRate());
+#endif
 
   if(!wantsFullUpdates)
   {
@@ -733,8 +741,15 @@ void ScenarioDocumentView::updateBackgroundMode()
   }
   else
   {
+#if defined(__EMSCRIPTEN__)
+    // On WASM, FullViewportUpdate at high rates starves the single-threaded event loop.
+    // Use MinimalViewportUpdate and let the background renderer request updates explicitly.
+    m_view.setViewportUpdateMode(QGraphicsView::MinimalViewportUpdate);
+    m_timer = startTimer(refreshRate, Qt::CoarseTimer);
+#else
     m_view.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
     m_timer = startTimer(refreshRate, Qt::PreciseTimer);
+#endif
   }
   m_view.update();
 }