LG 34WP550B Monitor Lag: A Compatibility, Driver, or Graphics Card Problem?


What causes a single LG 34WP550B monitor to lag on a Windows 10 PC with Nvidia GTX1060 6GB, while two monitors work fine?

I have a Windows 10 PC with Intel Core i3-10100f, Nvidia GTX1060 6GB, 16GB RAM and an asus prime h470 motherboard. I recently bought an LG 34WP550B monitor and set it up as a 75hz display. However, when I use this monitor alone, the system becomes laggy and unresponsive. When I connect another monitor, the system works smoothly. I checked the resource usage and did not find any anomalies. I wonder what could be the reason for this problem and how to fix it. Is it a compatibility issue, a driver issue, or something else? Has anyone experienced a similar issue with this monitor or this PC configuration? I appreciate any help or advice.


The LG 34WP550B is an ultrawide monitor with a 21:9 aspect ratio and a 2560×1080 resolution. It supports a refresh rate of 75hz, which can enhance the smoothness and responsiveness of the display. However, some users have reported that their Windows 10 PC becomes laggy and unresponsive when they use this monitor alone, but works fine when they connect another monitor. What could be the reason for this problem and how to fix it?

There are several possible causes for this issue, such as:

  • Incorrect monitor settings: The monitor may not be configured properly to match the PC’s output resolution and refresh rate. This can cause the PC to struggle to send the correct signal to the monitor, resulting in lag and stuttering. To fix this, the user should check the monitor’s settings and make sure they are compatible with the PC’s settings. For example, the user should set the monitor’s resolution to 2560×1080 and the refresh rate to 75hz, and also adjust the scaling and aspect ratio options if needed. The user can access the monitor’s settings by using the joystick button at the bottom of the monitor, or by using the LG OnScreen Control software.
  • Outdated or incompatible drivers: The PC may not have the latest or compatible drivers for the monitor or the graphics card. This can cause the PC to fail to recognize the monitor’s features and capabilities, resulting in poor performance and compatibility issues. To fix this, the user should update the drivers for the monitor and the graphics card, and make sure they are compatible with Windows 10. The user can download the latest drivers for the monitor from the LG website, and for the graphics card from the Nvidia website. The user should also check the Windows Update for any available updates for the PC.
  • Faulty or loose cables: The cables that connect the monitor and the PC may be damaged or not plugged in securely. This can cause the PC to lose the connection with the monitor, resulting in signal loss and flickering. To fix this, the user should check the cables and make sure they are in good condition and firmly connected to the ports. The user should also try using different cables or ports if possible, and avoid using any adapters or splitters that may interfere with the signal quality. The user should use a HDMI cable that supports the monitor’s resolution and refresh rate, such as a HDMI 2.0 or higher cable.
  • Graphics card problem: The graphics card may not be able to handle the monitor’s resolution and refresh rate, especially if the user is running demanding applications or games on the PC. This can cause the PC to lag and stutter, as the graphics card is overloaded with the workload. To fix this, the user should lower the settings of the applications or games, such as the resolution, graphics quality, or frame rate. The user should also monitor the graphics card’s temperature and usage, and make sure it is not overheating or overloading. The user can use a software such as MSI Afterburner to monitor and adjust the graphics card’s performance.
  • These

are some of the common causes and solutions for the LG 34WP550B monitor lag issue on a Windows 10 PC with Nvidia GTX1060 6GB. However, there may be other factors that contribute to this problem, such as the PC’s hardware, software, or configuration. Therefore, the user should try different troubleshooting methods and test the PC and the monitor in different scenarios to find the root cause and the best solution. The user should also contact LG or Nvidia customer support if the problem persists or worsens.

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