Huge delay in Auto completing Assign-to-do tasks in parallel action

Hi,

I have a requirement to assign tasks for four people using a parallel action and auto complete their task once they respond through info path form. So for each person, I'm using Assign-To-Do action in a parallel action and completing that in next branch using a UDA. In my UDA, i'm querying workflow task list and completing that task. It's working fine in my local but in production environment, its taking lot of time to come out from Assign-tot-do action. (All together there are 5 parallel actions in my workflow. Is this causing delay?)

Really appreciate for any help...

Thanks & regards,

Vino