Loops

The following points provide suggestions for ways to save resources when you are executing loops:

Analyze your loops to see whether you are repeating memory-intensive operations needlessly. For example, are there any variables that you can set outside the loop, rather than within it? Are you performing a conversion procedure each time through the loop that could be done outside the loop?
Consider whether you must loop only until a certain condition is met. If so, you might be able to exit the loop early. For example, suppose you are performing data validation on a string that should not contain numeric characters. If you have a loop that checks each character in a string to determine whether the string contains any numeric characters, you can exit the loop as soon as you find the first numeric character.
If you must refer to an element of an array within a loop, create a temporary variable that stores the element's value rather than referring to it within the array. Retrieving values from an array is slower than reading a variable of the same type.

Additional resources