The optimisation is evil crowd might suggest
Buy or rent a faster processor
Make use of more than one processor.
If that's not convenient, then probably the best way is to make your program do less.
Making your program do less usually involves simplifying your code by modifying your algorithm.
Another effective way, assuming that your program processes that same datafile more than once, is to index the file so that you can quickly find the bits you need each time.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
The "good enough" maybe good enough for the now, and perfection maybe unobtainable, but that should not preclude us from striving for perfection, when time, circumstance or desire allow.