GTA V's PC version is lauded as the game's definitive edition. While the popular and versatile Rockstar Editor has since made its debut on current-gen consoles, the PC version still enjoys the advantage of the superior visuals, modding and tweakability. Those superior visuals come at a pretty high price however.

While GTA V has been optimized well enough that it technically can run on extremely low-end machines, you'd need to twist the settings all the way down and even then the game would only just chug along. Not all of us run several thousand dollar rigs with a couple of Titans in SLi.
If you're a gamer on a budget, you've probably already become quite familiar with the methods of squeezing the best performance out of your hardware. Tweaking the options of the game to find the best possible performance while upping whatever settings aren't too taxing is just the first step. From tweaking system settings, overclocking hardware and configuring your display, you can do a dozen different things to get a better FPS.