V-Sync, short for vertical synchronisation, is a graphics setting designed to prevent screen tearing by aligning how frames are presented with a display’s refresh cycle. It addresses a timing mismatch between how quickly a game produces frames and how often a monitor updates the image on screen.
Screen tearing occurs when the GPU outputs a new frame while the display is mid-refresh. When this happens, parts of two different frames can appear on screen at the same time, creating a visible horizontal tear during motion. V-Sync attempts to prevent this by coordinating when frames are shown.
At a basic level, V-Sync works by waiting for the monitor to complete a refresh before presenting the next frame. This ties frame presentation to the display’s refresh rate, measured in Hertz (Hz). Because of this, V-Sync is often discussed alongside frame rate (FPS), as it controls when frames are presented to the display rather than changing how fast the GPU renders them.
The main benefit of V-Sync is visual stability. When it is working as intended, each refresh displays a complete frame, which removes tearing and makes motion appear cleaner, particularly during fast camera movement or horizontal panning.
The trade-off is timing. Because frames may have to wait for the next refresh window, V-Sync can introduce additional input delay. If the system cannot consistently meet the display’s refresh rate, frame delivery can also become uneven, resulting in stutter rather than a smooth reduction in performance.
From my own experience, V-Sync is most noticeable during fast camera pans, where tearing is easiest to spot, but the added latency can also make aiming feel slightly heavier in twitch-focused games.
It is also important to understand what V-Sync is not. It is a software- or driver-level synchronisation method and does not rely on special display hardware. Newer approaches such as variable refresh rate (VRR) work by dynamically adjusting the monitor’s refresh timing, but V-Sync itself operates independently of those technologies.
Because of these characteristics, V-Sync remains a common option in game settings menus. It represents a deliberate trade between visual stability and responsiveness, rather than a universal fix for all performance issues.