Optimisation

• The program is really slow
• The optimised program will continue to be correct
• The optimised program will continue to be readable
• The optimised program will continue to be reliable (cf buffer checks)

• Use more efficient data structures and algorithms
• Execution profile; focus on hot spots
• Use a more efficient environment (e.g. move a 4GL into C++)
• Capitalise on the compiler's optimisations
• Optimise code
  • Efficient use of hardware resources (parallelism)
  • Avoid system calls
  • Avoid the use of external data
  • Save temporary results
  • Pre-calculate results

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