about parallel programming Perl has his own history: some core modules provide the possibility to work in parallel: see the main tutorial perlthrtut

Using this core approach is a delicate matter; see here at perlmonks posts by BrowserUk and perhaps zentara using threads to have good quality examples.

IO::Async is for sure a good quality module, given his authorship and because it is mentioned in Task::Kensho (a florilegium of many good modules).

Here at perlmonks we also have the honor to have marioroy who dedicated himself to the creation of MCE Multi Core Engine; a suit of modules that helps you in implementing a parallel work correctly. SuperSearch marioroy's posts here for many good examples.

L*