Easing curves that feel expensive
The gap between a cheap site and a crafted one is rarely the colours or the type. It's the half-second of motion you can't quite name.

A menu opens. That's it — the whole event. But one menu snaps open like a spreadsheet cell, and another arrives: a touch fast at the start, then settling in, easing to rest the way a heavy door closes. Same menu. Same code, almost. The difference is the curve, and the curve is everything.
Linear is the tell
Default motion is linear — constant speed, start to stop. Nothing in the physical world moves like that. Objects have mass; they accelerate and decelerate. So linear animation reads, subconsciously, as fake. It's the single loudest signal of a cheap interface, and almost nobody can name it when they feel it.
The fix isn't more motion. It's better-shaped motion. An ease-out curve — quick to begin, slow to settle — is the workhorse of expensive-feeling UI, because it mimics how a real thing comes to rest.

Tune the curve to the tone
Speed carries meaning. Snappy, springy motion feels energetic and young — right for a streetwear drop, wrong for a private estate. Luxury motion is slower than you think, with a long, gentle deceleration that says unhurried. We routinely push transitions to 400 or 600 milliseconds for hospitality work, where a 150ms snap would feel cheap and anxious.
Anyone can make a thing move. The craft is in how it stops.
This is the most invisible work we do, and the most felt. Clients rarely point at the easing — they say the site feels "considered," or "calm," or "premium," and can't explain why. That's the point. The best motion isn't noticed. It's simply trusted, the way you trust a well-weighted door without ever thinking about the hinge.