Benchmarks workflow (lit/lit)

The Benchmarks workflow from lit/lit, explained and optimized by Latchkey.

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Source: lit/lit.github/workflows/benchmarks.ymlLicense BSD-3-ClauseView source

What it does

This is the Benchmarks workflow from the lit/lit repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-3-Clause license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: Benchmarks

on: [pull_request]

permissions:
  contents: read

jobs:
  benchmarks:
    name: benchmarks

    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - uses: actions/setup-node@v3
        with:
          node-version: 24.5
          cache: 'npm'
          cache-dependency-path: package-lock.json

      - uses: google/wireit@setup-github-actions-caching/v2

      - name: NPM install
        env:
          # Force installed chromedriver version to match the available chrome
          # version regardless of package-lock
          # https://github.com/giggio/node-chromedriver?tab=readme-ov-file#detect-chromedriver-version
          DETECT_CHROMEDRIVER_VERSION: true
        run: npm ci

      - name: Build
        run: |
          cd packages/benchmarks
          npm run build

      # lit-html:kitchen-sink
      - name: Benchmark lit-html/kitchen-sink
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-html/kitchen-sink/tachometer.json \
            --json-file lit-html-kitchen-sink.json

      # lit-html:template-heavy
      - name: Benchmark lit-html/template-heavy
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-html/template-heavy/tachometer.json \
            --json-file lit-html-template-heavy.json

      # lit-html:repeat
      - name: Benchmark lit-html/repeat
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-html/repeat/tachometer.json \
            --json-file lit-html-repeat.json

      # lit-element:list
      - name: Benchmark lit-element/list
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-element/list/tachometer.json \
            --json-file lit-element-list.json

      # reactive-element:list
      - name: Benchmark reactive-element/list
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config reactive-element/list/tachometer.json \
            --json-file reactive-element-list.json

      - name: Upload results
        uses: actions/upload-artifact@v4
        with:
          name: results
          path: |
            packages/benchmarks/lit-html-kitchen-sink.json
            packages/benchmarks/lit-html-template-heavy.json
            packages/benchmarks/lit-html-repeat.json
            packages/benchmarks/lit-element-list.json
            packages/benchmarks/reactive-element-list.json

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Benchmarks
 
on: [pull_request]
 
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  benchmarks:
    timeout-minutes: 30
    name: benchmarks
 
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v3
 
      - uses: actions/setup-node@v3
        with:
          node-version: 24.5
          cache: 'npm'
          cache-dependency-path: package-lock.json
 
      - uses: google/wireit@setup-github-actions-caching/v2
 
      - name: NPM install
        env:
          # Force installed chromedriver version to match the available chrome
          # version regardless of package-lock
          # https://github.com/giggio/node-chromedriver?tab=readme-ov-file#detect-chromedriver-version
          DETECT_CHROMEDRIVER_VERSION: true
        run: npm ci
 
      - name: Build
        run: |
          cd packages/benchmarks
          npm run build
 
      # lit-html:kitchen-sink
      - name: Benchmark lit-html/kitchen-sink
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-html/kitchen-sink/tachometer.json \
            --json-file lit-html-kitchen-sink.json
 
      # lit-html:template-heavy
      - name: Benchmark lit-html/template-heavy
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-html/template-heavy/tachometer.json \
            --json-file lit-html-template-heavy.json
 
      # lit-html:repeat
      - name: Benchmark lit-html/repeat
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-html/repeat/tachometer.json \
            --json-file lit-html-repeat.json
 
      # lit-element:list
      - name: Benchmark lit-element/list
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config lit-element/list/tachometer.json \
            --json-file lit-element-list.json
 
      # reactive-element:list
      - name: Benchmark reactive-element/list
        run: |
          cd packages/benchmarks
          npx tachometer \
            --config reactive-element/list/tachometer.json \
            --json-file reactive-element-list.json
 
      - name: Upload results
        uses: actions/upload-artifact@v4
        with:
          name: results
          path: |
            packages/benchmarks/lit-html-kitchen-sink.json
            packages/benchmarks/lit-html-template-heavy.json
            packages/benchmarks/lit-html-repeat.json
            packages/benchmarks/lit-element-list.json
            packages/benchmarks/reactive-element-list.json

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Cancel superseded runs when a branch or PR gets a newer push.
Add a job timeout so a hung step cannot burn hours of runner time.

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs

This workflow runs 1 job per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout actions/setup-node actions/upload-artifact