Performance
Performance Budget
Plain-language definitionAn agreed limit for page weight, script work, or speed metrics. It turns performance into a product constraint that can be checked before release.
Why it matters
Use the term to make a better decision.
In practice, performance budget matters when a team needs to connect a technical or creative choice to a visible change in clarity, performance, discovery, or conversion. The useful question is not whether the term sounds sophisticated. It is what decision it helps the team make.