I don't see this as a proper question for SO unless you ask computationally faster. Even then, with out specifying a specific architecture, compiler, etc, the question would be too broad or possibly opinion based for it to be a proper SO question, and if you haven't attempted to displayed considerable effort to research this yourself it's doubly inappropriate to ask here (since it could take a lot of effort to answer).

I feel this likely will end up violating the posting guide lines unless you've tested several methods of speed yourself, and are asking why something is faster in one instance than another.

You should only ask practical, answerable questions based on actual problems that you face. Chatty, open-ended questions diminish the usefulness of our site and push other questions off the front page.

Your questions should be reasonably scoped. If you can imagine an entire book that answers your question, you’re asking too much.

and :

What topics can I ask about here?

...

• a specific programming problem, or

...

• a practical, answerable problem that is unique to software development

We already have code review and software engineering, so if your question is in the realm of "better" with out regards to performance but in terms of SE quality, then those are the places to ask those types of questions.