Many players feel that their high refresh rate monitors aren't smooth enough, or notice obvious ghosting when quickly rotating the camera. This isn't necessarily because the monitor's specs are exaggerated—it's more likely that system settings, cable bandwidth, response time, or Overdrive settings aren't optimized. Refresh rate testing and ghosting testing can help you verify the actual frame rate and dynamic clarity your screen outputs, allowing the high refresh rate to truly work.

This article will explain how to use online tools like UFO Test for refresh rate and ghosting testing, and interpret key indicators such as response time, MPRT, and Overdrive to help you determine if your monitor is truly smooth and how to optimize settings.

1. Refresh Rate Test: Confirm Whether Your Monitor Reaches Its Rated Value

Refresh rate refers to how many times a monitor updates its image per second, measured in Hz. A monitor rated at 144Hz will only actually output 144Hz when both the system and cable support it. Before testing, complete the following settings:

  • System settings: In Windows, go to "Settings > System > Display > Advanced display settings" and select the highest refresh rate your monitor supports; on macOS, disable "Low Power Mode" in Display settings and select the highest refresh rate.
  • Graphics card control panel: In NVIDIA Control Panel or AMD Software, check the "Change resolution" page and confirm the refresh rate is set to the highest tier.
  • Cable and interface: HDMI 2.0 typically supports 1080p 240Hz or 1440p 144Hz, while 4K high refresh rate requires HDMI 2.1 or DisplayPort 1.4 and above; insufficient bandwidth will cause refresh rate options to be missing or automatically downgraded.

After completing the settings, open the UFO Test or similar online refresh rate test page. The page will display the actual refresh rate detected by the current browser and show a moving UFO pattern. If the displayed Hz matches the rating and the UFO moves smoothly without frame skipping, the basic refresh rate is normal; if it only shows 60Hz, check whether hardware acceleration is enabled in the browser, whether the system refresh rate hasn't taken effect, or whether the cable has insufficient bandwidth.

2. Ghosting Test: Observe the Clarity of Moving Images

Ghosting (also known as afterimage) is a blurring phenomenon that occurs on LCD monitors when displaying fast-moving objects—the previous frame hasn't fully disappeared while the next frame has already appeared. The more severe the ghosting, the less clear the moving image, and crosshairs, text, and edges in games become blurry.

UFO Test provides several ghosting test scenarios:

  • Moving UFO: Observe whether the edges of the UFO pattern are clear as it moves. If the UFO outline is blurry or shows obvious trailing, ghosting is significant.
  • Moving blocks and text: If fast-moving blocks or text on the test page are difficult to read while in motion, dynamic clarity is insufficient.
  • Pursuit camera test: Use a phone camera to follow the UFO's movement while filming, which allows for more intuitive comparison of ghosting length under different response time settings.

Ghosting is primarily determined by response time and MPRT. Response time (GtG) refers to the time required for a pixel to transition from one gray level to another—the lower the value, the less ghosting; MPRT (Moving Picture Response Time) is related to backlight strobing and frame duration. During testing, focus on whether the UFO pattern has a long trailing tail and whether reverse ghosting (overshoot) appears, the latter usually caused by Overdrive settings being too high.

3. Response Time and Overdrive Settings

Response time is the core indicator in ghosting testing. TN panels typically have faster response times, while IPS and VA panels are slower, though high-end Fast IPS and Fast VA have improved significantly. During testing, you can roughly judge response time performance by the length of the UFO pattern's trailing, but precise values require professional instruments.

Overdrive is a feature monitor manufacturers add to reduce response time by increasing pixel voltage to make liquid crystals flip faster. However, Overdrive settings that are too high introduce reverse ghosting: white or bright afterimages appear at object edges, making the image less natural. It's recommended to adjust Overdrive level by level during ghosting testing (usually off/low/medium/high), observe the moving UFO edges, and choose the setting with the shortest trailing and no obvious reverse ghosting. The optimal Overdrive setting may vary at different refresh rates, so determine it based on your daily usage scenarios.

4. Common Troubleshooting

  • Refresh rate option missing: First check cable specifications and interface version, then confirm whether the monitor requires enabling "High Refresh Rate Mode" or "Overclocking Mode" in the OSD menu.
  • Test page shows 60Hz: Disable browser power-saving settings and enable hardware acceleration; if using multiple monitors, ensure the target monitor is set as the primary display or open the test page on the corresponding screen.
  • Ghosting particularly severe: Check whether Overdrive is off or too high; set the refresh rate to the maximum; disable features like "Noise Reduction" or "Dynamic Contrast" in the OSD that may increase processing latency.
  • Reverse ghosting obvious: Lower the Overdrive setting until reverse ghosting disappears.

5. Daily Optimization Tips

  • Always use the highest refresh rate: High refresh rates significantly reduce perceived ghosting—even when not gaming, daily scrolling and window dragging feel smoother.
  • Enable VRR: G-Sync or FreeSync reduces screen tearing and stuttering, but note that some monitors may lock or require readjustment of Overdrive settings when enabled.
  • Choose high-quality cables: Prefer the DP cable that came with your monitor or certified HDMI 2.1 cables, and avoid adapters.
  • Regularly recheck settings: After system and graphics driver updates, refresh rate may revert to default—retest after driver updates.

6. Summary

Refresh rate testing and ghosting testing can help you confirm whether your monitor meets its rated performance and optimize dynamic clarity by adjusting system, cable, Overdrive, and VRR settings. High refresh rate is only the foundation—reasonable response time settings and a good cable environment are equally important. Regularly testing with online UFO Test can give you a more stable and smooth visual experience in gaming and design work.