Why we put a performance budget in every contract

Sites rarely launch slow. They get slow one video, tracking script and plugin at a time. A budget written into the contract stops that from the start.

What the budget covers

Spot & Key's default performance budget
MeasureOur limit
Largest Contentful Paint, mobileUnder 2.0 seconds
Interaction to Next PaintUnder 200 ms
Cumulative Layout ShiftUnder 0.05
JavaScript per page, compressedUnder 100 KB
Lighthouse performance score90 or higher

Why it's in the contract

Because it turns "make it fast" into something both sides can check. When a new feature would break the budget, we talk about the trade-off before building it, not after launch.

How we stay inside it

  • Images are sized for the screen they're shown on and served in modern formats.
  • Fonts are self-hosted and limited to two families.
  • Animation libraries load once and are shared by every page.
  • Third-party scripts go through a review; most marketing tags can load after the page.
  • Every pull request is measured automatically, so slow changes are caught the day they're made.

After launch, care plan clients get a monthly report against the same budget, so the site stays as fast as the day it went live.