[Etheryte]

For most apps, CLI or not, performance is not really a concern so long as it's good enough. Obsessing over performance before your program does The Thing is a great way to never actually get around to doing the useful bits. Now don't get me wrong, I'm not saying performance doesn't matter at all, but premature optimization and all its friends apply.

[nicce]

However, before you build the Thing, you should note that the architecture itself does not make impossible to improve the performance later on, if there is a possibility that it can make The Thing much better in the end.