Performance Postmortem: Mapbox Studio
Lovely performance "postmortem" from Eli Fitch about how MapBox got their first-meaningful-paint to drop from 4.7s to 1.9 seconds.
Some good insights into technical optimizations, but as always, the cultural aspects are the most difficult–and the most important.
Nurturing cultural awareness and enthusiasm for building fast, snappy, responsive, tactile products is arguably the most effective performance improvement you can make, but can be the most challenging, and requires the most ongoing attention.