Most PS2 games were coded to run at 30 FPS (NTSC) or 25 FPS (PAL). A 60 FPS patch forces the game logic to update at 60 FPS, making motion incredibly fluid—but it can also double game speed if not done correctly. The best patches fix speed and animation timing.
Applying 60 FPS patches in PCSX2 is relatively straightforward: pcsx2 60fps patch top