Deep dives
Cache headers, CDNs, and stale-while-revalidate
One header turns a cold cache into an instant page for roughly a third of visits, and it costs nothing to ship. What it does, and where it quietly breaks.
Archive
2026
30 posts
Guides
How to run a performance review that changes something
A meeting where everyone agrees the site is slow is not a review. It is a shared feeling.
Ask a dev
Five accessibility bugs worth a ticket today
Most audit findings are noise you can schedule. These five are not, and fixing them now saves the retrofit every team postpones for a quarter.
Guides
Service workers: the three lines worth having
Most service worker code is a caching library nobody asked for. A small one is genuinely useful.
Performance
Onboarding juniors: what actually helps
A first pull request stalls on setup, not on skill. Pair for a week, ship something small on day two, and finally write the README you keep meaning to.
CSS
Cascade layers, and when they stop helping
Layers fix specificity wars. They do not fix a design system with no opinions.
CSS
Subgrid is here. What it actually replaces
Not "grid, but nested". Subgrid replaces the hacks you wrote to line up things that are not siblings.
Guides
Your build has a budget. Here is how to set it
One number in CI does more for performance than any audit you run by hand. A two-week plan for teams whose scope keeps moving.