I am observing a significant difference in API response times between Katalon Studio and Postman for the same API. Postman response time: ~1.8 seconds Katalon response time: ~4.1 seconds Both requests are executed with the same endpoint, payload, and under similar network conditions. Howeve…

The API is not slower in Katalon You’re seeing framework overhead, not actual API delay Use response.getElapsedTime() for fair comparison Use dedicated tools if performance testing is your goal

[image] arvind.choudhary: You’re seeing framework overhead, not actual API delay What do you mean? Do you mean the target URL responds the same to Katalon and Postman, but Katalon Studio is slower than Postman in sending a request and digesting a response You should speak more clearly.

Framework overhead means→ The extra time added by Katalon itself ( the tool + execution engine), not by the API server. So total time ( Katalon) = Actual API Time + Katalon Processing Time

[image] saravanakumar1: How to accurately measure API performance … I would recommend you not to use Katalon for API testing.

[image] saravanakumar1: How to accurately measure API performance … I would rather write a bash script (or a python script) that calls curl for minimum overhead. I don’t have any hands-on experience of Postman, but as far as i read their doc , it looks good.

I am using Katalon for API testing, it is good only not that much bad. We cannot definitely compare to Postman or other API tools, but it is manageable. But you are right, if someone dedicatedly need for API testing then surely it is not a recommended tool.

I think, the API testing feature of Katalon Studio is bogus. Let me show you an example, see [image] Web service : save response as PDF file AI Testing In the <KatalonStudioInstallationDirectory>/Contents/Eclipse/configuration/resources/source director…

Kudos to your technical expertise

Yes , Postman is much faster than Katalon as let just say postman is a lightweight and much faster tool than katalon

API Response Time Higher in Katalon Compared to Postman

Web Testing

arvind.choudhary April 13, 2026, 12:02pm 2

The API is not slower in Katalon
You’re seeing framework overhead, not actual API delay
Use response.getElapsedTime() for fair comparison
Use dedicated tools if performance testing is your goal

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API Response Time Higher in Katalon Compared to Postman

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