diff --git a/.github/workflows/blockifier_ci.yml b/.github/workflows/blockifier_ci.yml
index 58048dfa09..52a1062e92 100644
--- a/.github/workflows/blockifier_ci.yml
+++ b/.github/workflows/blockifier_ci.yml
@@ -9,7 +9,9 @@ on:
       - v[0-9].**
     paths:
       - 'crates/blockifier/**'
-      - 'crates/native_blockifier/.cargo/config.toml'
+      - 'crates/native_blockifier/**'
+      - 'build_native_blockifier_in_docker.sh'
+      - 'scripts/build_native_blockifier.sh'
 
   pull_request:
     types:
@@ -20,7 +22,9 @@ on:
       - edited
     paths:
       - 'crates/blockifier/**'
-      - 'crates/native_blockifier/.cargo/config.toml'
+      - 'crates/native_blockifier/**'
+      - 'build_native_blockifier_in_docker.sh'
+      - 'scripts/build_native_blockifier.sh'
 
 jobs:
   featureless-build:
@@ -45,7 +49,7 @@ jobs:
           prefix-key: "v1-rust-ubuntu-20.04"
 
       - name: Build native blockifier
-        run: ./build_native_blockifier.sh
+        run: ./build_native_blockifier_in_docker.sh
 
         # Commit hash on pull request event would be the head commit of the branch.
       - name: Get commit hash prefix for PR update
diff --git a/.github/workflows/papyrus_docker-publish.yml b/.github/workflows/papyrus_docker-publish.yml
index 53c54d3047..70026edd4f 100644
--- a/.github/workflows/papyrus_docker-publish.yml
+++ b/.github/workflows/papyrus_docker-publish.yml
@@ -37,8 +37,8 @@ jobs:
         uses: docker/login-action@v2.1.0
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ secrets.GHCR_USERNAME }}
-          password: ${{ secrets.GHCR_TOKEN }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
           logout: true
 
       # Extract metadata (tags, labels) for Docker
@@ -47,7 +47,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v4.1.1
         with:
-          images: ${{ env.REGISTRY }}/${{ env.REPO_NAME }}
+          images: ${{ env.REGISTRY }}/${{ env.REPO_NAME }}/papyrus
           tags: |
             type=semver,pattern={{raw}}
             type=semver,pattern={{version}}
diff --git a/.gitignore b/.gitignore
index 2778bb95de..bc8e9a4262 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,6 @@ tmp_venv/*
 /.vscode
 # Git hooks
 /.husky
+
+# Python artifacts.
+scripts/__pycache__
diff --git a/build_native_blockifier.sh b/build_native_blockifier_in_docker.sh
similarity index 82%
rename from build_native_blockifier.sh
rename to build_native_blockifier_in_docker.sh
index 8274992eda..a1989ad64b 100755
--- a/build_native_blockifier.sh
+++ b/build_native_blockifier_in_docker.sh
@@ -13,4 +13,4 @@ docker run \
     -v "${HOME}:${HOME}" \
     --workdir ${PWD} \
     ${docker_image_name} \
-    cargo build --release -p native_blockifier --features "testing"
+    scripts/build_native_blockifier.sh
diff --git a/scripts/build_native_blockifier.sh b/scripts/build_native_blockifier.sh
new file mode 100755
index 0000000000..db56e326c7
--- /dev/null
+++ b/scripts/build_native_blockifier.sh
@@ -0,0 +1,21 @@
+#!/bin/env bash
+set -e
+
+function clean() {
+    echo "Cleaning up..."
+    deactivate || true
+    rm -rf venv || true
+}
+
+
+function build() {
+    echo "Building..."
+    pushd crates/native_blockifier
+    pypy3.9 -m venv venv
+    source venv/bin/activate
+    cargo build --release -p native_blockifier --features "testing" || clean
+    clean
+    popd
+}
+
+build
diff --git a/scripts/committer/generate_committer_flamegraph.sh b/scripts/committer/generate_committer_flamegraph.sh
new file mode 100644
index 0000000000..d1d680595c
--- /dev/null
+++ b/scripts/committer/generate_committer_flamegraph.sh
@@ -0,0 +1,27 @@
+set -e
+
+if [ "$GITHUB_ACTIONS" = true ]; then
+    echo "This script is not meant to be run in GitHub Actions."
+    exit 1
+fi
+
+# Restore security level in perf_event_paranoid at the end.
+ORIGINAL_PARANOID=$(echo $(sysctl kernel.perf_event_paranoid) | grep -o '[0-9]$')
+trap 'sudo sysctl kernel.perf_event_paranoid=$ORIGINAL_PARANOID' EXIT SIGINT SIGTERM
+
+if ! command -v jq; then
+    cargo install jq
+fi
+if ! command -v flamegraph; then
+    cargo install flamegraph
+fi
+if ! command -v perf; then
+    sudo apt-get install linux-tools-common linux-tools-generic linux-tools-`uname -r`
+fi
+
+ROOT_DIR=$(git rev-parse --show-toplevel)
+BENCH_INPUT_FILES_PREFIX=$(cat ${ROOT_DIR}/crates/committer_cli/src/tests/flow_test_files_prefix)
+# Lower security level in perf_event_paranoid to 2 to allow cargo to use perf without running on root.
+sudo sysctl kernel.perf_event_paranoid=2
+
+gcloud storage cat gs://committer-testing-artifacts/${BENCH_INPUT_FILES_PREFIX}/committer_flow_inputs.json | jq -r .committer_input | CARGO_PROFILE_RELEASE_DEBUG=true cargo flamegraph -p committer_cli -- commit