How to delay process flow

[Igor Kravzov]

Will try to explain what I mean.
I have a flow which reads a file with input data, splits it by line, sends
each new line as a search parameter to InvokeHttp PR and processes
results.  It is so fast that I get "Rate limit exceeded" for some requests
:)
I need to put some kind of delay before calling InvokeHttp PR. Is it
possible?