when you say "Load data in production server"

its means you process the file or you bring the data from the Source database.

If its source database check if the what kind of response you are getting. because there are cases in which you get slow response from the source server due to network traffic, if its a remote location then might be your broadband connection speed.

there are many cases you need to check which side is causing the bottleneck.

hope it helps.