diff --git a/.github/workflows/deploy-github-page.yml b/.github/workflows/deploy-github-page.yml
index 94c0894b..fc6c728e 100644
--- a/.github/workflows/deploy-github-page.yml
+++ b/.github/workflows/deploy-github-page.yml
@@ -56,19 +56,19 @@ jobs:
           echo "PREFIX=$PREFIX" >> $GITHUB_ENV
           export SYSROOT_PATH=$BUILD_PREFIX/opt/emsdk/upstream/emscripten/cache/sysroot
 
+          micromamba create -n node-env -c conda-forge nodejs=22
+          export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
+
           emcmake cmake \
             -DCMAKE_BUILD_TYPE=Release                        \
             -DCMAKE_INSTALL_PREFIX=$PREFIX                    \
             -DXEUS_CPP_EMSCRIPTEN_WASM_BUILD=ON               \
             -DCMAKE_FIND_ROOT_PATH=$PREFIX                    \
             -DSYSROOT_PATH=$SYSROOT_PATH                      \
-            -DCMAKE_COMPILE_WARNING_AS_ERROR=ON            \
+            -DCMAKE_COMPILE_WARNING_AS_ERROR=ON               \
             ..
 
-          micromamba create -n node-env -c conda-forge nodejs=22
-          export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
-
-          make check-xeus-cpp
+          emmake make check-xeus-cpp -j ${{ env.ncpus }}
           emmake make -j ${{ env.ncpus }} install
 
       - name: Test Emscripten xeus-cpp in browser
@@ -123,7 +123,7 @@ jobs:
             cd ./chrome/opt/google/chrome/
             export PATH="$PWD:$PATH"
             cd -
-  
+
             # Install Firefox
             wget https://ftp.mozilla.org/pub/firefox/releases/138.0.1/linux-x86_64/en-GB/firefox-138.0.1.tar.xz
             tar -xJf firefox-138.0.1.tar.xz
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3a4a1689..ee5801fe 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -228,19 +228,19 @@ jobs:
           echo "PREFIX=$PREFIX" >> $GITHUB_ENV
           export SYSROOT_PATH=$BUILD_PREFIX/opt/emsdk/upstream/emscripten/cache/sysroot
 
+          micromamba create -n node-env -c conda-forge nodejs=22
+          export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
+
           emcmake cmake \
             -DCMAKE_BUILD_TYPE=Release                        \
             -DCMAKE_INSTALL_PREFIX=$PREFIX                    \
             -DXEUS_CPP_EMSCRIPTEN_WASM_BUILD=ON               \
             -DCMAKE_FIND_ROOT_PATH=$PREFIX                    \
             -DSYSROOT_PATH=$SYSROOT_PATH                      \
-            -DCMAKE_COMPILE_WARNING_AS_ERROR=ON            \
+            -DCMAKE_COMPILE_WARNING_AS_ERROR=ON               \
             ..
 
-          micromamba create -n node-env -c conda-forge nodejs=22
-          export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
-
-          make check-xeus-cpp
+          emmake make check-xeus-cpp -j ${{ env.ncpus }}
           emmake make -j ${{ env.ncpus }} install
 
       - name: Test Emscripten xeus-cpp in browser
@@ -300,7 +300,7 @@ jobs:
             cd ./chrome/opt/google/chrome/
             export PATH="$PWD:$PATH"
             cd -
-  
+
             # Install Firefox
             wget https://ftp.mozilla.org/pub/firefox/releases/138.0.1/linux-x86_64/en-GB/firefox-138.0.1.tar.xz
             tar -xJf firefox-138.0.1.tar.xz
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7c6d42b7..f68b64b6 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -84,6 +84,9 @@ export BUILD_PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-build
 export PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-host
 export SYSROOT_PATH=$BUILD_PREFIX/opt/emsdk/upstream/emscripten/cache/sysroot
 
+micromamba create -n node-env -c conda-forge nodejs=22
+export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
+
 emcmake cmake \
         -DCMAKE_BUILD_TYPE=Release                        \
         -DCMAKE_INSTALL_PREFIX=$PREFIX                    \
@@ -92,10 +95,7 @@ emcmake cmake \
         -DSYSROOT_PATH=$SYSROOT_PATH                      \
         ..
 
-micromamba create -n node-env -c conda-forge nodejs=22
-export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
-
-make check-xeus-cpp
+emmake make check-xeus-cpp
 emmake make install
 ```
 
diff --git a/README.md b/README.md
index 0615ae40..bff97d94 100644
--- a/README.md
+++ b/README.md
@@ -99,6 +99,9 @@ export BUILD_PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-build
 export PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-host
 export SYSROOT_PATH=$BUILD_PREFIX/opt/emsdk/upstream/emscripten/cache/sysroot
 
+micromamba create -n node-env -c conda-forge nodejs=22
+export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
+
 emcmake cmake \
         -DCMAKE_BUILD_TYPE=Release                        \
         -DCMAKE_INSTALL_PREFIX=$PREFIX                    \
@@ -107,10 +110,7 @@ emcmake cmake \
         -DSYSROOT_PATH=$SYSROOT_PATH                      \
         ..
 
-micromamba create -n node-env -c conda-forge nodejs=22
-export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
-
-make check-xeus-cpp
+emmake make check-xeus-cpp
 emmake make install
 ```
 
diff --git a/docs/source/InstallationAndUsage.rst b/docs/source/InstallationAndUsage.rst
index af8fa635..873a2eba 100644
--- a/docs/source/InstallationAndUsage.rst
+++ b/docs/source/InstallationAndUsage.rst
@@ -79,6 +79,9 @@ You are now in a position to build the xeus-cpp kernel. You build and test it in
     export PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-host
     export SYSROOT_PATH=$BUILD_PREFIX/opt/emsdk/upstream/emscripten/cache/sysroot
 
+    micromamba create -n node-env -c conda-forge nodejs=22
+    export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
+
     emcmake cmake \
 		-DCMAKE_BUILD_TYPE=Release                        \
 		-DCMAKE_INSTALL_PREFIX=$PREFIX                    \
@@ -87,10 +90,7 @@ You are now in a position to build the xeus-cpp kernel. You build and test it in
 		-DSYSROOT_PATH=$SYSROOT_PATH                      \
 		..
 
-    micromamba create -n node-env -c conda-forge nodejs=22
-    export PATH="$MAMBA_ROOT_PREFIX/envs/node-env/bin:$PATH"
-
-    make check-xeus-cpp
+    emmake make check-xeus-cpp
     emmake make install
 
 It is possible to run the Emscripten tests in a headless browser. We will run our tests in a fresh installed browser. Installing the browsers, and running the tests within the installed browsers will be platform dependent. To do this for Chrome and Firefox on MacOS execute the following