Code repetition is only cheap if you abandon and forget about the repeated code. Any time you need to have to care about the code to fix bugs, security issues o

Code repetition is only cheap if you abandon and forget about the repeated code. Any time you need to have to care about the code to fix bugs, security issues or improve performance, it is expensive do each of those things once, repeating them multiple times can mean an order of magnitude difference in the worse case.