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The Performance Budget We Give Every New Build

Slow interfaces cost conversions long before anyone files a complaint. We walk through the concrete performance budget we hand our engineers on day one and how we hold ourselves to it.

MWritten by the Mytos teamJul 5, 20265 min read
The Performance Budget We Give Every New Build

Nobody files a support ticket that says 'your site felt 400 milliseconds too slow'. They just leave. Slow interfaces bleed conversions silently, which is exactly why we treat performance as a budget we set on day one — not a cleanup task we hope to get to before launch.

That budget is concrete: a ceiling on how much JavaScript ships, a target for how fast the first meaningful content appears, and a hard limit on layout shift so nothing jumps under the user's thumb. If a new feature would blow the budget, that is a design conversation, not a silent regression.

We hold the line with automation. Every build is measured, and the numbers are visible to the whole team — so performance is a shared responsibility, not one engineer's heroics the week before go-live. When a metric drifts, we know before the user does.

The payoff is a product that feels instant, ranks better, and converts more — and stays that way, because the budget keeps enforcing itself long after we ship.

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