High Response time when using Arrivals Thread Group

[Steve Anson]

I am facing some issues while executing it from this particular arrival thread group.  I am getting very high response time when I use arrival thread group. 

 

But when I try executing the same request from normal thread group I could see very less response time. 

 

for example : 

Normal Thread group - 200ms

Arrival Thread group - 900ms

 

Can you please help me to figure out what could be the reason behind this?