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- [FUNCTION_THROTTLED](/docs/errors/function_throttled.md): The FUNCTION_THROTTLED error occurs when your Vercel Functions exceed the concurrent execution limit, often due to a sudden request spike or backend
- [Custom error pages](/docs/custom-error-pages.md): Custom error pages are available on Enterprise plans Custom error pages let you replace Vercel's platform error pages with your own branded
- [Throttles](#throttles)[](/docs/functions/usage-and-pricing/legacy-pricing.md): This counts the number of times that a request to your Functions could not be served because the concurrency limit was hit. While this is not a
- [Concurrency scaling](/docs/functions/concurrency-scaling.md): Vercel automatically scales your functions to handle traffic surges, ensuring optimal performance during increased loads. Automatic concurrency

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