Cursor with hold for select takes too long

I am facing issues with cursor with hold for select.

If I execute select quaery without cursor it takes 13 seconds,

If execute it like 

Begin;

Cursor "sql1" with hold for select.... ;fetch 100 to "sql1"

It takes more than 3 minutes.

Even sometimes it takes more than 10 minutes.

What could be the problem?

Request to help on this ASAP.

I am facing this issue on production. 

I checked locks etc. But nothing like that.

Thanks & Regards

Bindra