diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
new file mode 100644
index 0000000..9002b03
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,181 @@
+name: Benchmark
+
+on:
+  push:
+    branches:
+      - benchmark
+
+jobs:
+  build_linux_binary:
+    name: Build Linux binary
+    runs-on: ${{ matrix.os }}
+    env:
+      CARGO: cargo
+      TARGET_DIR: ./target
+      RUST_BACKTRACE: 1
+    strategy:
+      matrix:
+        build: [linux]
+        include:
+          - build: linux
+            os: ubuntu-18.04
+            rust: stable
+            target: x86_64-unknown-linux-musl
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ matrix.rust }}
+        profile: minimal
+        override: true
+        target: ${{ matrix.target }}
+
+    - name: Use Cross
+      run: |
+        cargo install cross
+        echo "CARGO=cross" >> $GITHUB_ENV
+        echo "TARGET_FLAGS=--target ${{ matrix.target }}" >> $GITHUB_ENV
+        echo "TARGET_DIR=./target/${{ matrix.target }}" >> $GITHUB_ENV
+
+    - name: Show command used for Cargo
+      run: |
+        echo "cargo command is: ${{ env.CARGO }}"
+        echo "target flag is: ${{ env.TARGET_FLAGS }}"
+        echo "target dir is: ${{ env.TARGET_DIR }}"
+
+    - name: Build static binary
+      run: ${{ env.CARGO }} build ${{ env.TARGET_FLAGS }} --verbose --release
+
+    - uses: actions/upload-artifact@v2
+      with:
+        name: frum-linux
+        path: target/x86_64-unknown-linux-musl/release/frum
+  
+  benchmark_init_on_linux:
+    name: Benchmark init (Linux)
+    needs: [build_linux_binary]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: octokit/request-action@v2.x
+        id: get_benchmark_workflows
+        with:
+          route: GET /repos/:repository/actions/runs
+          repository: ${{ github.repository }}
+          branch: benchmark
+          status: completed
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - uses: octokit/request-action@v2.x
+        id: get_latest_release
+        with:
+          route: GET /repos/:repository/releases/latest
+          repository: ${{ github.repository }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Take the output
+        run: |
+          URL=$(echo '${{ steps.get_latest_release.outputs.data }}' | jq -r '.assets | map(select(.name | endswith("x86_64-unknown-linux-musl.tar.gz"))) | .[0].browser_download_url')
+          echo $URL
+          curl -L $URL -H 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' > /tmp/frum-latest.tar.gz
+          mkdir ~/.frum-latest
+          tar -zxvf /tmp/frum-latest.tar.gz -C ~/.frum-latest --strip-components=1
+          ls -lah ~/.frum-latest
+      - uses: actions/checkout@v2
+      - name: Install hyperfine
+        run: |
+          wget https://github.com/sharkdp/hyperfine/releases/download/v1.10.0/hyperfine_1.10.0_amd64.deb
+          sudo dpkg -i hyperfine_1.10.0_amd64.deb
+      - name: Install rbenv
+        run: |
+          git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
+          git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
+      - uses: actions/download-artifact@v2
+        with:
+          name: frum-linux
+          path: target/release/
+      - name: Run benchmarks
+        run: ./benchmarks/run_init
+
+      - run: lscpu
+
+      - name: Read basic.md for the generated report
+        id: basic_result
+        uses: juliangruber/read-file-action@v1
+        with:
+          path: benchmarks/results/basic.md
+
+      - uses: octokit/request-action@v2.x
+        with:
+          route: POST /repos/:repository/commits/:commit_sha/comments
+          repository: ${{ github.repository }}
+          commit_sha: ${{ github.sha }}
+          body: |
+            |
+            ${{ steps.basic_result.outputs.content }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  benchmark_all_on_linux:
+    name: Benchmark all (Linux)
+    needs: [build_linux_binary]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: octokit/request-action@v2.x
+        id: get_benchmark_workflows
+        with:
+          route: GET /repos/:repository/actions/runs
+          repository: ${{ github.repository }}
+          branch: benchmark
+          status: completed
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - uses: octokit/request-action@v2.x
+        id: get_latest_release
+        with:
+          route: GET /repos/:repository/releases/latest
+          repository: ${{ github.repository }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Take the output
+        run: |
+          URL=$(echo '${{ steps.get_latest_release.outputs.data }}' | jq -r '.assets | map(select(.name | endswith("x86_64-unknown-linux-musl.tar.gz"))) | .[0].browser_download_url')
+          echo $URL
+          curl -L $URL -H 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' > /tmp/frum-latest.tar.gz
+          mkdir ~/.frum-latest
+          tar -zxvf /tmp/frum-latest.tar.gz -C ~/.frum-latest --strip-components=1
+          ls -lah ~/.frum-latest
+      - uses: actions/checkout@v2
+      - name: Install hyperfine
+        run: |
+          wget https://github.com/sharkdp/hyperfine/releases/download/v1.10.0/hyperfine_1.10.0_amd64.deb
+          sudo dpkg -i hyperfine_1.10.0_amd64.deb
+      - name: Install rbenv
+        run: |
+          git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
+          git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
+      - uses: actions/download-artifact@v2
+        with:
+          name: frum-linux
+          path: target/release/
+      - name: Run benchmarks
+        run: ./benchmarks/run
+
+      - run: lscpu
+
+      - name: Read basic.md for the generated report
+        id: basic_result
+        uses: juliangruber/read-file-action@v1
+        with:
+          path: benchmarks/results/basic.md
+
+      - uses: octokit/request-action@v2.x
+        with:
+          route: POST /repos/:repository/commits/:commit_sha/comments
+          repository: ${{ github.repository }}
+          commit_sha: ${{ github.sha }}
+          body: |
+            |
+            ${{ steps.basic_result.outputs.content }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/benchmarks/frum b/benchmarks/frum
new file mode 100755
index 0000000..d028f09
--- /dev/null
+++ b/benchmarks/frum
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+eval "$(~/.frum-latest/frum init)"
+~/.frum-latest/frum install 2.6.5
+~/.frum-latest/frum local 2.6.5
+ruby -v
diff --git a/benchmarks/frum_reason b/benchmarks/frum_reason
new file mode 100644
index 0000000..5c03fca
--- /dev/null
+++ b/benchmarks/frum_reason
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+eval "$(frum init)"
+frum install 2.6.5
+frum local 2.6.5
+ruby -v
diff --git a/benchmarks/rbenv b/benchmarks/rbenv
new file mode 100755
index 0000000..219706b
--- /dev/null
+++ b/benchmarks/rbenv
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+eval "$(rbenv init -)"
+rbenv install 2.6.5
+rbenv local 2.6.5
+ruby -v
diff --git a/benchmarks/run b/benchmarks/run
new file mode 100755
index 0000000..cb194d4
--- /dev/null
+++ b/benchmarks/run
@@ -0,0 +1,54 @@
+# #!/bin/bash
+
+set -e
+
+export frum_DIR
+
+BASE_DIR="$(dirname "$(realpath "$0")")"
+cd "$BASE_DIR" || exit 1
+
+frum_DIR="$(mktemp -d)"
+export PATH="$BASE_DIR/../target/release:$PATH"
+
+mkdir results 2>/dev/null || :
+
+if [ ! -f "$BASE_DIR/../target/release/frum" ]; then
+  echo "Can't access the release version of frum"
+  exit 1
+fi
+
+if ! command -v hyperfine >/dev/null 2>&1; then
+  echo "Can't access Hyperfine. Are you sure it is installed?"
+  echo "  if not, visit https://github.com/sharkdp/hyperfine"
+  exit 1
+fi
+
+chmod +x ./frum
+chmod +x ./frum_reason
+chmod +x ./rbenv
+chmod +x ~/.frum-latest/frum
+chmod +x ../target/release/frum
+
+export PATH="$HOME/.rbenv/bin:$PATH"
+export PATH="$HOME/.rbenv/shims:$PATH"
+
+# command exists?
+~/.frum-latest/frum -V
+frum -V
+rbenv -v
+frum install 2.6.5
+rbenv install 2.6.5
+frum global 2.6.5
+rbenv global 2.6.5
+
+hyperfine \
+  --warmup 2 \
+  --min-runs=20 \
+  --time-unit=millisecond \
+  --export-json="./results/basic.json" \
+  --export-markdown="./results/basic.md" \
+  --show-output \
+  --prepare 'rm -rf ~/.rbenv/versions/2.6.5 ~/.frum/versions/2.6.5' \
+  "./rbenv" \
+  "./frum" \
+  "./frum_reason"
diff --git a/benchmarks/run_init b/benchmarks/run_init
new file mode 100755
index 0000000..c35ac7d
--- /dev/null
+++ b/benchmarks/run_init
@@ -0,0 +1,51 @@
+# #!/bin/bash
+
+set -e
+
+export frum_DIR
+
+BASE_DIR="$(dirname "$(realpath "$0")")"
+cd "$BASE_DIR" || exit 1
+
+frum_DIR="$(mktemp -d)"
+export PATH="$BASE_DIR/../target/release:$PATH"
+
+mkdir results 2>/dev/null || :
+
+if [ ! -f "$BASE_DIR/../target/release/frum" ]; then
+  echo "Can't access the release version of frum"
+  exit 1
+fi
+
+if ! command -v hyperfine >/dev/null 2>&1; then
+  echo "Can't access Hyperfine. Are you sure it is installed?"
+  echo "  if not, visit https://github.com/sharkdp/hyperfine"
+  exit 1
+fi
+
+chmod +x ~/.frum-latest/frum
+chmod +x ../target/release/frum
+
+export PATH="$HOME/.rbenv/bin:$PATH"
+export PATH="$HOME/.rbenv/shims:$PATH"
+
+# command exists?
+~/.frum-latest/frum -V
+frum -V
+rbenv -v
+frum install 2.6.5
+rbenv install 2.6.5
+frum global 2.6.5
+rbenv global 2.6.5
+
+hyperfine \
+  --warmup 2 \
+  --min-runs=20 \
+  --time-unit=millisecond \
+  --export-json="./results/basic.json" \
+  --export-markdown="./results/basic.md" \
+  --show-output \
+  --prepare 'rm -rf ~/.rbenv/versions/2.6.5 ~/.frum/versions/2.6.5' \
+  'eval "$(rbenv init -)"' \
+  'eval "$(frum init)"' \
+  'eval "$(~/.frum-latest/frum init)"' \
diff --git a/src/commands/install.rs b/src/commands/install.rs
index f1937d0..0d22666 100644
--- a/src/commands/install.rs
+++ b/src/commands/install.rs
@@ -227,6 +227,8 @@ fn build_package(
     };
     debug!("make install");
     let make_install = Command::new("make")
+        .arg("-j")
+        .arg(&num_cpus::get().to_string())
         .arg("install")
         .current_dir(&current_dir)
         .output()