Is there a way to run my process at a higher priority with user's permission?

Question

Is there any way at all that my process's priority can be set to, say, above normal on Windows in a C/C++ application? If it takes an administrator privilege prompt, then fine, if it takes even more prompts, then fine, but my application runs noticeably better when at above normal or higher and I'd less tech-savvy users to be able to run it that way.

Edit: it should be noted it's multi-threaded, and that probably has something to do with why it runs better on above normal (or better yet, high).