diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 65fdaea..78f9c16 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -130,8 +130,8 @@ jobs:
           cache-to: type=gha,mode=max,scope=base_linux/${{ matrix.platform }}-${{ matrix.dockerfile }}
           tags: baseonly
 
-  base_cpan_build:
-    needs: [get_dependencies, base_build]
+  cpan_build:
+    needs: [get_dependencies]
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -175,7 +175,7 @@ jobs:
           GHCR_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}   
           DOCKERFILE: ${{ matrix.dockerfile }}
 
-      - name: Build base cpan layer for ${{ matrix.platform }}
+      - name: Build cpan packages for ${{ matrix.platform }}
         uses: docker/build-push-action@v5
         with:
           context: .
@@ -185,10 +185,10 @@ jobs:
           push: false
           target: base-cpan
           cache-from: | 
-            type=gha,scope=base_linux/${{ matrix.platform }}-${{ matrix.dockerfile }}
+            type=gha,scope=build_linux/${{ matrix.platform }}-${{ matrix.dockerfile }}
             type=gha,scope=base-cpan_linux/${{ matrix.platform }}-${{ matrix.dockerfile }}
           cache-to: type=gha,mode=max,scope=base-cpan_linux/${{ matrix.platform }}-${{ matrix.dockerfile }}
-          tags: basecpanonly
+          tags: buildcpanonly
     
             
   test_build:
@@ -254,6 +254,30 @@ jobs:
             type=ref,event=branch,suffix=${{ matrix.dockerfile }}
             type=ref,event=pr,suffix=${{ matrix.dockerfile }}
 
+      - name: Build and cache fhem base layer
+        uses: docker/build-push-action@v5
+        id: docker_build_fhem
+        with:
+          context: .
+          load: true  
+          file: ./Dockerfile${{ matrix.dockerfile }}
+          platforms: linux/amd64
+          push: false
+          target: with-fhem-bats
+          cache-from: | 
+            type=gha,scope=fhem_linux/amd64-${{ matrix.dockerfile }}
+            type=gha,scope=base_linux/amd64-${{ matrix.dockerfile }}            
+          cache-to: type=gha,mode=max,scope=fhem_linux/amd64-${{ matrix.dockerfile }}
+          tags: with-fhem
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            BUILD_DATE=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
+            IMAGE_VERSION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}
+            IMAGE_VCS_REF=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}
+            L_USAGE=${{ github.server_url }}/${{ github.repository }}/blob/${{ github.sha }}/README.md
+            L_VCS_URL=${{ github.server_url }}/${{ github.repository }}/
+            L_AUTHORS=${{ github.server_url }}/${{ github.repository }}/graphs/contributors
+
       - name: Build for bats with fhem base layer
         uses: docker/build-push-action@v5
         id: docker_build_bats
@@ -265,9 +289,7 @@ jobs:
           push: false
           target: with-fhem-bats
           cache-from: | 
-            type=gha,scope=base_linux/amd64-${{ matrix.dockerfile }}
-            type=gha,scope=full_linux/amd64-${{ matrix.dockerfile }}            
-          cache-to: type=gha,mode=max,scope=full_linux/amd64-${{ matrix.dockerfile }}
+            type=gha,scope=fhem_linux/amd64-${{ matrix.dockerfile }}
           tags: bats-withfhem
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
@@ -301,8 +323,8 @@ jobs:
           push: false
           target: with-fhem-extended-python-nodejs
           cache-from: | 
-            type=gha,scope=base_linux/amd64-${{ matrix.dockerfile }}  
-            type=gha,scope=full_linux/amd64-${{ matrix.dockerfile }}
+            type=gha,scope=full_linux/amd64-${{ matrix.dockerfile }}  
+            type=gha,scope=fhem_linux/amd64-${{ matrix.dockerfile }}
           cache-to: type=gha,mode=max,scope=full_linux/amd64-${{ matrix.dockerfile }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
@@ -333,7 +355,7 @@ jobs:
 
   published_build:
     runs-on: ubuntu-latest
-    needs: [test_build, base_cpan_build]
+    needs: [test_build, cpan_build]
     strategy:
       matrix:
         dockerfile: [-bullseye, -threaded-bullseye]
@@ -397,10 +419,11 @@ jobs:
           context: .
           load: false  
           file: ./Dockerfile${{ matrix.dockerfile }}
-          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/386
           push: ${{ github.event_name != 'pull_request' }}
           target: with-fhem-extended-python-nodejs
           cache-from: | 
+            type=gha,scope=base-cpan_linux/386-${{ matrix.dockerfile }}
             type=gha,scope=base-cpan_linux/arm64-${{ matrix.dockerfile }}
             type=gha,scope=base-cpan_linux/arm/v7-${{ matrix.dockerfile }}
             type=gha,scope=full_linux/amd64-${{ matrix.dockerfile }}
@@ -440,17 +463,16 @@ jobs:
           context: .
           load: false  
           file: ./Dockerfile${{ matrix.dockerfile }}
-          platforms: linux/386,linux/amd64,linux/arm/v7,linux/arm64
+          platforms: linux/386,linux/amd64,linux/arm/v7,linux/arm64,386
           push: ${{ github.event_name != 'pull_request' }}
           target: with-fhem
           cache-from: | 
             type=gha,scope=base_linux/arm64-${{ matrix.dockerfile }}
             type=gha,scope=base_linux/amd64-${{ matrix.dockerfile }}
             type=gha,scope=base_linux/arm/v7-${{ matrix.dockerfile }}
+            type=gha,scope=base_linux/386-${{ matrix.dockerfile }}
             type=gha,scope=full_linux/amd64-${{ matrix.dockerfile }}
             type=gha,scope=full_linux/cross-${{ matrix.dockerfile }}
-            type=gha,scope=base_linux/cross-${{ matrix.dockerfile }}
-          cache-to: type=gha,mode=max,scope=base_linux/cross-${{ matrix.dockerfile }}
           tags: ${{ steps.meta_base.outputs.tags }}
           labels: ${{ steps.meta_base.outputs.labels }}
           build-args: |
diff --git a/Dockerfile-bullseye b/Dockerfile-bullseye
index a2389a6..af4257c 100644
--- a/Dockerfile-bullseye
+++ b/Dockerfile-bullseye
@@ -2,7 +2,7 @@
 # 
 # base layer with perl and some general preparations
 #
-FROM perl:5.36.3-bullseye@sha256:e341d89b87dbf8caf8a3e33e8d606e1cb4f975d43553a083040fae3402d078c3 as base
+FROM perl:5.36.3-slim-bullseye as base
 
 ARG TARGETPLATFORM
 
@@ -28,9 +28,7 @@ RUN <<EOF
     LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get install -qqy --no-install-recommends \
         ca-certificates \
         gnupg \
-        locales \
-        libusb-dev \
-        python3-dev  
+        locales 
     LC_ALL=C c_rehash 
     LC_ALL=C DEBIAN_FRONTEND=noninteractive dpkg-reconfigure locales 
     echo 'de_DE@euro ISO-8859-15\nde_DE ISO-8859-1\nde_DE.UTF-8 UTF-8\nen_DK ISO-8859-1\nen_DK.ISO-8859-15 ISO-8859-15\nen_DK.UTF-8 UTF-8\nen_GB ISO-8859-1\nen_GB.ISO-8859-15 ISO-8859-15\nen_GB.UTF-8 UTF-8\nen_IE ISO-8859-1\nen_IE.ISO-8859-15 ISO-8859-15\nen_IE.UTF-8 UTF-8\nen_US ISO-8859-1\nen_US.ISO-8859-15 ISO-8859-15\nen_US.UTF-8 UTF-8\nes_ES@euro ISO-8859-15\nes_ES ISO-8859-1\nes_ES.UTF-8 UTF-8\nfr_FR@euro ISO-8859-15\nfr_FR ISO-8859-1\nfr_FR.UTF-8 UTF-8\nit_IT@euro ISO-8859-15\nit_IT ISO-8859-1\nit_IT.UTF-8 UTF-8\nnl_NL@euro ISO-8859-15\nnl_NL ISO-8859-1\nnl_NL.UTF-8 UTF-8\npl_PL ISO-8859-2\npl_PL.UTF-8 UTF-8' >/etc/locale.gen 
@@ -48,10 +46,41 @@ EOF
 # Install all CPAN Modules, needed from FHEM and standard modules
 #
 
-FROM base as base-cpan 
+FROM perl:5.36.3-bullseye as build-cpan 
 
 COPY cpanfile /usr/src/app/core-cpanfile
 
+# Install Packages used for building cpan modules:
+RUN <<EOF
+  LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get install -qqy --no-install-recommends \
+      libusb-dev \
+      python3-dev  
+  LC_ALL=C apt-get autoremove -qqy && LC_ALL=C apt-get clean 
+  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
+EOF
+
+#
+# Fixup modules which do not work on all platforms and install afterwards
+# Install Modules from CPAN
+#
+
+# JSON::XS isn't marked as compatible with Perl 5.36, we prevent some output
+ENV PERL_CANARY_STABILITY_NOPROMPT=1 
+RUN <<EOF
+  if [ "${TARGETPLATFORM}" != "linux/amd64" ] && [ "${TARGETPLATFORM}" != "linux/i386" ]; then 
+    sed -i '/Device::Firmata::Constants/d' /usr/src/app/core-cpanfile  
+  fi
+  
+  cpm install --without-test --with-suggests --with-recommends --cpanfile /usr/src/app/core-cpanfile --show-build-log-on-failure --configure-timeout=360 --workers=$(nproc)
+
+  rm -rf /root/.cpanm 
+  rm -rf /root/.perl-cpm/
+  rm -rf /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
+EOF
+
+
+FROM base as base-cpan 
+
 RUN <<EOF
     LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get update 
     LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get install -qqy --no-install-recommends \
@@ -95,29 +124,15 @@ RUN <<EOF
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
 EOF
 
-#
-# Fixup modules which do not work on all platforms and install afterwards
-# Install Modules from CPAN
-#
-
-# JSON::XS isn't marked as compatible with Persl 5.36, we prevent some output
-ENV PERL_CANARY_STABILITY_NOPROMPT=1 
-RUN <<EOF
-  if [ "${TARGETPLATFORM}" != "linux/amd64" ] && [ "${TARGETPLATFORM}" != "linux/i386" ]; then 
-    sed -i '/Device::Firmata::Constants/d' /usr/src/app/core-cpanfile  
-  fi
-  cpm install --without-test --with-suggests --with-recommends --cpanfile /usr/src/app/core-cpanfile --show-build-log-on-failure --global --configure-timeout=360 --workers=2
-
-  rm -rf /root/.cpanm 
-  rm -rf /root/.perl-cpm/
-  rm -rf /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
-EOF
+COPY --from=build-cpan /usr/src/app/local/lib/perl5 /usr/src/app/local/lib/perl5
 
 #
 # Standard FHEM Layer
 #
 FROM base-cpan as with-fhem
 
+ENV PERL5LIB=/usr/src/app/local/lib/perl5
+
 # Install base environment and FHEM Docker module
 COPY src/entry.sh src/health-check.sh src/ssh_known_hosts.txt /
 COPY src/FHEM/99_DockerImageInfo.pm /fhem/FHEM/
@@ -246,7 +261,7 @@ RUN <<EOF
     sed -i '/Device::Firmata::Constants/d' /usr/src/app/3rdparty-cpanfile
   fi
 
-  cpm install --cpanfile /usr/src/app/3rdparty-cpanfile --without-test --with-recommends --with-suggests --show-build-log-on-failure --global --configure-timeout=360 --workers=2
+  cpm install --cpanfile /usr/src/app/3rdparty-cpanfile --without-test --with-recommends --with-suggests --show-build-log-on-failure --configure-timeout=360 --workers=$(nproc)
   rm -rf /root/.cpanm 
   rm -rf /root/.perl-cpm
 EOF
diff --git a/Dockerfile-threaded-bullseye b/Dockerfile-threaded-bullseye
index 18340bc..b1a9511 100644
--- a/Dockerfile-threaded-bullseye
+++ b/Dockerfile-threaded-bullseye
@@ -2,7 +2,7 @@
 # 
 # base layer with perl and some general preparations
 #
-FROM perl:5.36.3-threaded-bullseye@sha256:688a4d97874189bd38cf19fb665c0068978ab1f217a8d0cdc99f02dd23ad9cc9 as base
+FROM perl:5.36.3-slim-threaded-buster as base
 
 ARG TARGETPLATFORM
 
@@ -28,9 +28,7 @@ RUN <<EOF
     LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get install -qqy --no-install-recommends \
         ca-certificates \
         gnupg \
-        locales \
-        libusb-dev \
-        python3-dev  
+        locales 
     LC_ALL=C c_rehash 
     LC_ALL=C DEBIAN_FRONTEND=noninteractive dpkg-reconfigure locales 
     echo 'de_DE@euro ISO-8859-15\nde_DE ISO-8859-1\nde_DE.UTF-8 UTF-8\nen_DK ISO-8859-1\nen_DK.ISO-8859-15 ISO-8859-15\nen_DK.UTF-8 UTF-8\nen_GB ISO-8859-1\nen_GB.ISO-8859-15 ISO-8859-15\nen_GB.UTF-8 UTF-8\nen_IE ISO-8859-1\nen_IE.ISO-8859-15 ISO-8859-15\nen_IE.UTF-8 UTF-8\nen_US ISO-8859-1\nen_US.ISO-8859-15 ISO-8859-15\nen_US.UTF-8 UTF-8\nes_ES@euro ISO-8859-15\nes_ES ISO-8859-1\nes_ES.UTF-8 UTF-8\nfr_FR@euro ISO-8859-15\nfr_FR ISO-8859-1\nfr_FR.UTF-8 UTF-8\nit_IT@euro ISO-8859-15\nit_IT ISO-8859-1\nit_IT.UTF-8 UTF-8\nnl_NL@euro ISO-8859-15\nnl_NL ISO-8859-1\nnl_NL.UTF-8 UTF-8\npl_PL ISO-8859-2\npl_PL.UTF-8 UTF-8' >/etc/locale.gen 
@@ -48,10 +46,41 @@ EOF
 # Install all CPAN Modules, needed from FHEM and standard modules
 #
 
-FROM base as base-cpan 
+FROM perl:5.36.3-threaded-buster as build-cpan 
 
 COPY cpanfile /usr/src/app/core-cpanfile
 
+# Install Packages used for building cpan modules:
+RUN <<EOF
+  LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get install -qqy --no-install-recommends \
+      libusb-dev \
+      python3-dev  
+  LC_ALL=C apt-get autoremove -qqy && LC_ALL=C apt-get clean 
+  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
+EOF
+
+#
+# Fixup modules which do not work on all platforms and install afterwards
+# Install Modules from CPAN
+#
+
+# JSON::XS isn't marked as compatible with Perl 5.36, we prevent some output
+ENV PERL_CANARY_STABILITY_NOPROMPT=1 
+RUN <<EOF
+  if [ "${TARGETPLATFORM}" != "linux/amd64" ] && [ "${TARGETPLATFORM}" != "linux/i386" ]; then 
+    sed -i '/Device::Firmata::Constants/d' /usr/src/app/core-cpanfile  
+  fi
+  
+  cpm install --without-test --with-suggests --with-recommends --cpanfile /usr/src/app/core-cpanfile --show-build-log-on-failure --configure-timeout=360 --workers=$(nproc)
+
+  rm -rf /root/.cpanm 
+  rm -rf /root/.perl-cpm/
+  rm -rf /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
+EOF
+
+
+FROM base as base-cpan 
+
 RUN <<EOF
     LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get update 
     LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get install -qqy --no-install-recommends \
@@ -95,29 +124,15 @@ RUN <<EOF
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
 EOF
 
-#
-# Fixup modules which do not work on all platforms and install afterwards
-# Install Modules from CPAN
-#
-
-# JSON::XS isn't marked as compatible with Persl 5.36, we prevent some output
-ENV PERL_CANARY_STABILITY_NOPROMPT=1 
-RUN <<EOF
-  if [ "${TARGETPLATFORM}" != "linux/amd64" ] && [ "${TARGETPLATFORM}" != "linux/i386" ]; then 
-    sed -i '/Device::Firmata::Constants/d' /usr/src/app/core-cpanfile  
-  fi
-  cpm install --without-test --with-suggests --with-recommends --cpanfile /usr/src/app/core-cpanfile --show-build-log-on-failure --global --configure-timeout=360 --workers=2
-
-  rm -rf /root/.cpanm 
-  rm -rf /root/.perl-cpm/
-  rm -rf /tmp/* /var/tmp/* ~/.[^.] ~/.??* ~/*
-EOF
+COPY --from=build-cpan /usr/src/app/local/lib/perl5 /usr/src/app/local/lib/perl5
 
 #
 # Standard FHEM Layer
 #
 FROM base-cpan as with-fhem
 
+ENV PERL5LIB=/usr/src/app/local/lib/perl5
+
 # Install base environment and FHEM Docker module
 COPY src/entry.sh src/health-check.sh src/ssh_known_hosts.txt /
 COPY src/FHEM/99_DockerImageInfo.pm /fhem/FHEM/
@@ -246,7 +261,7 @@ RUN <<EOF
     sed -i '/Device::Firmata::Constants/d' /usr/src/app/3rdparty-cpanfile
   fi
 
-  cpm install --cpanfile /usr/src/app/3rdparty-cpanfile --without-test --with-recommends --with-suggests --show-build-log-on-failure --global --configure-timeout=360 --workers=2
+  cpm install --cpanfile /usr/src/app/3rdparty-cpanfile --without-test --with-recommends --with-suggests --show-build-log-on-failure --configure-timeout=360 --workers=$(nproc)
   rm -rf /root/.cpanm 
   rm -rf /root/.perl-cpm
 EOF
@@ -322,4 +337,4 @@ ADD https://github.com/grayhemp/bats-mock.git /opt/bats/test_helper/bats-mock
 
 WORKDIR /code/
 
-ENTRYPOINT [ "/usr/local/bin/bats" ]
\ No newline at end of file
+ENTRYPOINT [ "/usr/local/bin/bats" ]