diff --git a/.github/actions/bench/action.yml b/.github/actions/bench/action.yml
index 3df503473..c20638123 100644
--- a/.github/actions/bench/action.yml
+++ b/.github/actions/bench/action.yml
@@ -69,12 +69,12 @@ runs:
     - name: Run benchmark
       shell: ${{ env.SHELL }}
       run: |
-        tests bench -c ${{ inputs.perf }} --cross-prefix="${{ inputs.cross_prefix }}" \
+        ./scripts/tests bench -c ${{ inputs.perf }} --cross-prefix="${{ inputs.cross_prefix }}" \
               --cflags="${{ inputs.cflags }}" --arch-flags="${{ inputs.archflags }}" \
               $([[ ${{ inputs.opt }} == "false" ]] && echo "--no-opt")  \
               -v --output=output.json ${{ inputs.bench_extra_args }}
 
-        tests bench --components -c ${{ inputs.perf }} --cross-prefix="${{ inputs.cross_prefix }}" \
+        ./scripts/tests bench --components -c ${{ inputs.perf }} --cross-prefix="${{ inputs.cross_prefix }}" \
               --cflags="${{ inputs.cflags }}" --arch-flags="${{ inputs.archflags }}" \
               $([[ ${{ inputs.opt }} == "false" ]] && echo "--no-opt")  \
               -v --output=output.json ${{ inputs.bench_extra_args }}
diff --git a/.github/actions/setup-shell/action.yml b/.github/actions/setup-shell/action.yml
index b5fbd83d8..5e153d2b5 100644
--- a/.github/actions/setup-shell/action.yml
+++ b/.github/actions/setup-shell/action.yml
@@ -4,11 +4,8 @@ name: Set Shell
 description: Setup nix or custom shell for workflows
 
 inputs:
-  use-nix:
-    description: Indicate whether to use nix or not
-    default: 'true'
   nix-shell:
-    description: Run in the specified Nix environment if exists
+    description: Run in the specified Nix environment if exists. If empty, custom shell will be used instead of nix.
     default: 'ci'
   nix-cache:
     description: Determine whether to enable nix cache
@@ -28,7 +25,7 @@ runs:
   steps:
     - name: Setup nix
       uses: ./.github/actions/setup-nix
-      if: ${{ inputs.use-nix == 'true' && (env.SHELL == '' || env.Nix_SHELL != inputs.nix-shell) }}
+      if: ${{ inputs.nix-shell != '' }}
       with:
         devShell: ${{ inputs.nix-shell }}
         verbose: ${{ inputs.nix-verbose }}
@@ -36,7 +33,7 @@ runs:
         script: ${{ inputs.script }}
     - name: Set custom shell
       shell: bash
-      if: ${{ inputs.use-nix != 'true' && env.SHELL == '' }}
+      if: ${{ inputs.nix-shell == '' }}
       run: |
           echo SHELL="${{ inputs.custom_shell }}" >> $GITHUB_ENV
 
diff --git a/.github/workflows/bench_ec2_reusable.yml b/.github/workflows/bench_ec2_reusable.yml
index 902d50644..c0cac4ec1 100644
--- a/.github/workflows/bench_ec2_reusable.yml
+++ b/.github/workflows/bench_ec2_reusable.yml
@@ -98,19 +98,54 @@ jobs:
           ec2-instance-type: ${{ inputs.ec2_instance_type }}
           subnet-id: subnet-07b2729e5e065962f
           security-group-id: sg-0ab2e297196c8c381
-  bench:
-    name: Bench ${{ inputs.name }}
+  # bench_nix:
+  #   name: Bench nix ${{ inputs.name }}
+  #   runs-on: ${{ needs.start-ec2-runner.outputs.label }}
+  #   needs: start-ec2-runner # required to start the main job when the runner is ready
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #     - uses: ./.github/actions/bench
+  #       with:
+  #         nix-shell: bench
+  #         nix-cache: false
+  #         nix-verbose: ${{ inputs.verbose }}
+  #         name: ${{ inputs.name }}
+  #         cflags: ${{ inputs.cflags }}
+  #         archflags: ${{ inputs.archflags }}
+  #         opt: ${{ inputs.opt }}
+  #         perf: PERF
+  #         store_results: ${{ inputs.store_results }}
+  #         bench_extra_args: ${{ inputs.bench_extra_args }}
+  #         gh_token: ${{ secrets.AWS_GITHUB_TOKEN }}
+  #         cross_prefix: ${{ inputs.cross_prefix }}
+  bench_clang:
+    name: Bench nix ${{ inputs.name }}
     runs-on: ${{ needs.start-ec2-runner.outputs.label }}
     needs: start-ec2-runner # required to start the main job when the runner is ready
     steps:
       - uses: actions/checkout@v4
+      - name: Install clang
+        run: |
+          sudo apt-get update
+          sudo apt-get install python3-venv python3-pip make clang-18 -y
+          python3 -m venv venv
+          source venv/bin/activate
+          python3 -m pip install -r requirements.txt
+#          deactivate
+          export CC=clang-18
+#          export BASH_ENV=$(pwd)/venv/bin/activate
+      - name: test
+        runs: |
+          which python3
+          echo $CC
       - uses: ./.github/actions/bench
         with:
-          nix-shell: bench
+          nix-shell: ''
+          custom-shell: 'bash'
           nix-cache: false
           nix-verbose: ${{ inputs.verbose }}
-          name: ${{ inputs.name }}
-          cflags: ${{ inputs.cflags }}
+          name: ${{ inputs.name }} (clang-18)
+          cflags: ${{ inputs.cflags }} -mtune=native -march=native
           archflags: ${{ inputs.archflags }}
           opt: ${{ inputs.opt }}
           perf: PERF
@@ -125,7 +160,8 @@ jobs:
       id-token: 'write'
     needs:
       - start-ec2-runner
-      - bench # required to wait when the main job is done
+      # - bench_nix # required to wait when the main job is done
+      - bench_clang # required to wait when the main job is done
     runs-on: ubuntu-latest
     if: ${{ always() }} # required to stop the runner even if the error happened in the previous jobs
     steps: