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https://optimizeyourimage.com/docs/problems/concurrency-limit-exceeded

What it means

The account reached its limit of simultaneously processing requests. The response carries a Retry-After header.

How to resolve it

Lower client-side parallelism to your plan’s concurrency, or upgrade the plan.

Retrying

Retry shortly; a slot frees as soon as an in-flight request finishes. Rejected requests are not billed.

Include the X-Request-Id response header when contacting [email protected] about a specific failure.