This is the talk that I gave at ImageCon 2018, then followed up with an encore at the San Francisco Web Performance Meetup. The slides here are from the second performance.
You can watch my the ImageCon performance, if video is your thing.
You can also download a PDF of the ImageCon slides, if you'd like, though this presentation is more meaningful with the transcript.
This presentation is WHAT to do. You'll be able to download the HOW-TO guide shortly.