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Hz / FPS Test Information
The Refresh Rate test uses your browser’s requestAnimationFrame API to measure the real-time frequency at which your display is being updated. This is critical for ensuring that your Windows/macOS display settings, GPU drivers, and browser settings are all correctly harmonized.
🔢 Current Hz/FPS: The large number represents the average frames per second over the last 500ms.
⏱️ High-Precision Sync: We use the performance.now() timestamp to ensure 0.001ms precision in our calculations.
✅ Stable Number: If your monitor is 144Hz, the number should hover extremely close to 143.9xx - 144.0xx.
⚠️ Lower than Expected: If you have a 120Hz monitor but the test shows 60.000, your operating system or browser is likely capped. Check your display settings or ensure “Use hardware acceleration when available” is enabled in your browser.
📈 Fluctuating Number (Jitter): If the number jumps wildly (e.g., 144 to 120 to 150), it indicates that your CPU/GPU is under heavy load, or a background process is interfering with the browser’s timing.
🔋 Power Saving: Laptops on battery often cap the refresh rate to 60Hz. Plug in or set to “High Performance” to unlock the full rate.
🖥️ Multi-Monitor setups: Many browsers sync to the refresh rate of the “slowest” monitor in a multi-monitor setup if windows are overlapping.
🔗 VSync: If you see “60” but want “144”, make sure your HDMI or DisplayPort version supports the higher bandwidth and that the cable is rated for it.
Accurate 144Hz test, 240Hz monitor check, 360Hz diagnostic, browser FPS meter, online Hz tester.