GoFaster.io allows you to track the performance of your website over time and send benchmarks directly to Slack.  How it works:1) Create an account on gofaster.io
2) Add a tiny JavaScript snippet to your site that automatically harvests performance data from your user's browsers.
3) Click the "Add to Slack" button to authorize
4) GoFaster.io then collects and crunches the performance data from users on your site and notifies you and your team on slack once per day with critical performance benchmarks and alerts.Get started over at https://gofaster.ioGoFaster.io is a paid service with a 15-day, no credit card required, free trial.