Performance Tools Reporting: bundlephobia.com GTmetrix sitespeed.io Speed Curve [$] Web Page Test Sonarwhal Datadog [$] PWMetrics Treo JS Tools: imagemin ImageOptim-CLI Budgeting: performancebudget.io References/Docs: Jank Free Performance of ES6 features relative to the ES5 Checklist: The Front-End Checklist Front-End Performance Checklist 2018