Getting Postmark's Lighthouse Performance Score to 100

Earlier this year, our design team spent a few weeks analyzing and improving the performance of the Postmark product website. Our app is known for lightning-fast email delivery, and we wanted to provide a similar experience to the visitors of the website. Conveniently, what's good for people is also good for robots -- search engines increasingly use performance and user experience metrics as a ranking factor in search results. Once completed, this project made the Postmark site significantly faster and increased our Lighthouse Performance score from 68 to a perfect 100. We do our best to keep regressions in check, but the nature of releasing something new often works against us.