Quick field scan

I need to provide a method to scan for a character string
contained anywhere within a field 25 characters long..
The user wants this to be an INTERACTIVE process.

the file contains around 75k to 100k records.

I have a rpg program that uses the scan op code within a do loop.

I run this program interactivelyand I get my results in about
 3 minutes (48cpw).  
I say "Sorry, we are not going to eat up that many cycles for
this interactivly, we will run this in batch."

So my user asks:  "Well then, why is it that I can look at a
report in my outq with all the data (1400 pages) and scan
and find the data in 30 to 50 seconds, and It takes you 3
minutes?"

I know that there is something about spool files that makes
this type of scanning much faster.

so the questions are:  
    Is there a method to perform this type of scan interactivly?
        (by interactive I mean, to go through 75k records in 30 to
         50 seconds)
    
    What is the reason that the spool file find is so much faster?


Thank you...


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