So when building a voice agent on vapi, which is better; using the native google calender that is in vapi to create event and check availability OR just building everything on n8n and connecting it to your vapi voice agent.

So i was testing my voice ai agent that i made with retell ai and there was a problem when i ran multiple test at the same time. The test took a long time to finish and when it finished it said error due to timeout from the automation that i set up in n8n. When going to n8n to check the problem i saw that because i was running mutiple executions at the same time it queued up and after some time it returned as error due to timeout. So i want to ask if there is a way to solve this problem or i am doing it wrong.