Enhancing performance for loop inside loop processing..........

Hi ,

my current program has the following code

Loop at itab1.

..................

loop at itab2

where f1 = itab1-f1.

endloop.

..............

endloop.

in itab1 there 20,000. and itab2 there are 10,000 records

The above code is causing a great bottle neck .is their any way to enhance the performance.

please help .