Big difference in performance between non-gui and gui executions

**Valentina** ([Bug 65399](https://bz.apache.org/bugzilla//show_bug.cgi?id=65399&redirect=false)):
Hi,
I've been comparing results of different load test executions and i've been getting a big difference in performance.
Executing in command line gives a longer response time (about 100% or 200% more).
The thread group i use is "Concurrency Thread Group". I run the test with 100 users and hold it for 10 seconds.
I've tested public apis (dog api, cat api, etc), i get this results with https://random.dog too. I've tried httpbin (https://httpbin.org/) and i get a similar difference.
I don't know if i'm doing something wrong. Any help or comment please?
Thanks in advance.

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