Data Action timeout during high throughput load test

Does anyone know the hard limit for Genesys Cloud Data Actions when pushing 500 concurrent requests via JMeter? The flow stalls at the HTTP request node with a 504 Gateway Timeout after exactly 120 seconds, even though the backend endpoint responds in under 200ms.

• Increased the timeout to 300s in the Data Action configuration.
• Verified the external API is not rate limiting by testing with curl.

This looks like a threading bottleneck in the orchestration layer rather than an API timeout. In Zendesk, we hit similar walls when webhooks queued up without proper concurrency controls, so try batching those 500 requests into smaller chunks of 50 to avoid overwhelming the GC execution engine.