Each plan comes with a concurrency limit. For example, the Developer plan allows 10 concurrent requests, meaning you can have up to 10 requests running simultaneously, significantly improving speed.

Sending requests above that limit will result in a 429 Too Many Requests error.

We wrote a guide on using concurrency that provides more details, including examples in Python and JavaScript. The same principles apply to other languages and libraries.

Does ZenRows Have no-code Options?Can I See the XHR / AJAX / Fetch Requests that Browsers Perform?