If Automation is triggered with multiple actions at once will all automation be executed?

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Use the “when record created” action and the automation will run for each record that is created. That same automation will not run again for the same record. Later actions in the same automation run will not have access to values set previously in the same automation run unless you explicitly do a fresh read of the data or otherwise get it from a scripting action.

Let me dive more deeply into the issue.
We have assessment questions 1, 2, 3, 4…etc. Users come and answer to these questions. Depending on the answer in question 1, 2 etc. there is a filed which needs to be updated for the record created.
I already use trigger “when record created” and for each user that starts the assessment new record is created. This part is fine. But there is a case where several users started the assessment at the same time, which means that answers were provided in approximately the same time, which further means that automation must be run for all those users/records created. In my example, automation is triggered for 5 users but not triggered for 3 users. Do you think the issue is in automation performance or something else?

I hope I managed to explain the use case properly.