Is there a copy program faster than Opus's internal copy function?

[Xyzzy]

@SoBreezyInChile

For example, why not make FastCopy's copy function replace Directory Opus's original copy function?

Because you cannot delegate the most basic function of your software to a third party you have completely no control over.
Because FastCopy is not a silver bullet of any kind - I had issues with in the past on my hardware/network.
Because you can easily set up your DO to completely replace build-in function.