Handle concurrent user request

How to handle concurrent user request on Gatling response time, and how it effects the groups timing ?

Politeness formulas?

Hi @stephane

for my scenario, i have req1, req2, req3, … req6. Out of that req1, req2, req3 running sequentially but req4, req5, and req6 running parallel. how to simulate from our script and how to capture response time for req1, req2, req3, and the response time for the parallel request.