In the original Quake III Arena OpenGL renderer, enter r_swapInterval 0 in the console to request VSync off. If the change does not take effect, restart the video system or game; if you are using a different renderer, check its own setting instead.
Turn VSync off in the original Quake III Arena renderer
- Open the in-game console and enter
r_swapInterval 0. The original renderer registersr_swapIntervalwith a default value of0and marks it archived and latched in the Quake III Arena source. - If the command does not apply immediately, enter
vid_restartor restart the game. Because the variable is latched, a video or game restart may be needed for the renderer to pick up the change. - To make the setting persistent, add
seta r_swapInterval "0"to the active configuration file. Back up the file before editing it. A Steam Community discussion identifiesq3config.cfgas a configuration recovery point.
The value-to-meaning mapping is practical community guidance: in that 2019 Steam discussion, a respondent described 1 as VSync on and 0 as off. This is not a guarantee that every Quake III build or renderer handles the same variable.
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Check your configuration file location
Paths differ by operating system and engine. The ioquake3 README lists these configuration locations for ioquake3:
| Operating system | ioquake3 configuration location |
|---|---|
| Windows | %AppData%Quake3 |
| macOS | ~/Library/Application Support/Quake3 |
| Linux | ~/.config/Quake3 |
These are ioquake3 conventions, not universal paths for every commercial release or fork. On Linux, the README distinguishes configuration from data and internal-state directories. A custom fs_homepath can also change where files are stored; the original release used /home/.q3a.
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If the setting appears to do nothing
Identify the renderer
Do not assume all Quake III derivatives use r_swapInterval. For example, the Kenny Edition Vulkan fork documents a separate r_vsync cvar and says a video restart is required after changing it. Use the control documented for the renderer you actually run.
Check driver-level synchronization
Graphics-driver settings can affect the result seen in game. If the in-game change does not match what you observe, check the driver’s synchronization configuration as well as the active renderer and its cvar.
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Choose based on what you want to change
VSync and frame-rate limits are separate controls. VSync concerns synchronization with display refresh; com_maxfps is a distinct frame-rate setting mentioned alongside r_swapinterval in the Steam discussion. Community reports also describe movement behavior changing with frame rate, but that is not a universal recommendation about an ideal cap.
- If you want to avoid visible tearing, compare the result with synchronization enabled and disabled on your own system.
- If responsiveness is your priority, evaluate how the controls feel in your own setup rather than assuming a specific latency improvement.
- Observe frame-rate behavior separately from tearing and responsiveness; changing VSync does not establish a particular FPS result.
The cited source code establishes the original renderer’s cvar and default, while the 2019 community post supplies the on/off interpretation. Neither establishes a universal measured change in latency, image quality, or performance across hardware.
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