Frame Rate (FPS) is a technical term that is extremely important in rendering and optimizing game graphics (technical art). A measure of how many times the screen is redrawn per second (unit: FPS), and is the most important physical performance value that determines the game's smoothness and response speed to player operations.
Real-world analogy: Relationship between "page turning speed" and smoothness of a flip book
The frame rate is the "speed of flipping through a flipbook (number of pages per second)". If you don't scroll 15 pages per second (15FPS), the movement will look like a shaky clay animation. Turning 60 pages per second (60FPS) looks extremely smooth, as if a real human were moving. Furthermore, when you reach 90 pages (90FPS) using VR goggles, your brain will think of it as ``real, smooth movement in space,'' allowing you to enjoy the ultimate sense of immersion without getting 3D motion sickness.
Figure: Infographic that clearly illustrates the basic processing flow and mechanism of Frame Rate (frame rate / FPS) in Japanese notation
Detailed mechanism and operating principle
Use Profiler to remove the bottleneck of the CPU/GPU and thoroughly keep the total processing time for one frame below the target FPS limit time (16.6ms or less for 60FPS, 11.1ms or less for 90FPS).