The only cases where I've seen rewrites work are when the software fails to consistently complete the task it was written to do. A lot of software is garbage bu

The only cases where I've seen rewrites work are when the software fails to consistently complete the task it was written to do. A lot of software is garbage but gets the job done. When you encounter hot spots its best to slowly refactor until you get the system where it needs to be. Lots of little changes mitigate risk, and it is easier to track down bugs if you make a mistake.