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# Third-Party performance budget calculator

Import a CSV of third-party scripts and split byte, request, and main-thread budgets across them by priority weight, with over-budget vendors called out and reports to export.

Paste an inventory to split the budgets across it.

The allocation is arithmetic over whatever you pasted: it never loads the page, measures anything, or checks that a vendor is worth its bytes. Budgets constrain cost, not value; weights are a convention you may disagree with; and the figures are only as honest as the measurement run they came from. Vendors load differently on every pageview, so treat one Lighthouse report as one sample. Sync flags and facade suggestions are heuristic: a sync script is render-blocking, and an optional vendor over 100 KB is a facade candidate, nothing stronger.
Options

## More web & auth tools

- [INP interaction profiler](/browser/inp-interaction-profiler)
- [HTTP header parser](/web/headers)
- [robots.txt tester](/web/robots)
[All web & auth tools](/web)

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Canonical HTML: https://nutter.tools/web/third-party-performance-budget-calculator
Markdown version: https://nutter.tools/web/third-party-performance-budget-calculator.md
Plain-text version: https://nutter.tools/web/third-party-performance-budget-calculator.txt
Agent index: https://nutter.tools/llms.txt