Hey people, this topic was made to share the solution of the problem of running GTA V on a PC or even a laptop with low end specifications. If you're playing GTA V with very low FPS, here are a list of small things that might help you:
1: Change the Graphics card control panel settings for best performance (meant for NVIDIA, AMD and even Intel's 'Graphics Properties' option.
2: Prefer to stay at Windows 7 OS or directly upgrade to Windows 10 OS. Never ever install Windows 8 / 8.1.
3: Set the total paging file size option to 1.5 times your RAM memory in virtual memory settings (Click on 'Properties' of your PC > then click on 'Advanced system settings' > under Performance region, click 'Settings' > click 'Advanced' tab > under Virtual memory, click 'Change' > set Initial and Final size to 1.5 times your PC RAM for Selected Drive: C only).
4: Before starting the game, I select the best performance option in visual effects settings (again through PC Properties) and sometimes I set the game's priority to "High" (through Task Manager).
GTA V runs between 26 - 30 FPS in Very High + High settings and it runs at 38+ FPS with normal settings!