Fast for you, frozen for everyone else — that's the API wall

Every vibe-coded app hits the same ceiling: it runs beautifully for one user and collapses the moment real traffic shows up.

One API call, instant. Ten, still fine. A hundred at once, and the app just froze — users refreshing the page like it's 2004. That's the API wall, and it's not a fluke, it's the default outcome of chaining calls, waiting on responses, with no retry logic, no rate limiting, and no queuing. It works flawlessly in the demo and dies reliably in production, because a demo is one user and production is never one user.

The fix isn't more API calls. It's architecture — the boring stuff no vibe-coding tutorial covers.

Two checks from this doctrine

Real value, not a teaser — two of the 5 checks in full. The rest are in the one-pager.

If your app is fast for you but slow for everyone else, you've already hit the wall — you just don't know it yet.