2. Would it improve Acrobat's performance?
2. Would it improve the performance of Acrobat Pro?
I don't think you can do that yourself. JS is an interpreted (ie, non-compiled) programming language by definition.
I think Adobe converted some JS code to machine code and deployed it with Acrobat, but that's not something you as an end user can do.
As far as I know, Acrobat is using SpiderMonkey as it's JS engine. It might be possible to use a standalone SpiderMonkey implementation to compile byte code that Acrobat will accept. I would not expect this to work, and even if a first test would look like success, I would not trust this unsupported and undocumented way to pre-compiling folder level scripts.