Turning off the Link Layer Topology Discovery Mapper I/O Driver on your PC should generally not have any negative impact if you're primarily using your machine for gaming. This driver is part of the network discovery features in Windows, which are used to detect and map devices on a network.
Here are a few considerations:
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Network Discovery: If you frequently use shared resources, like network drives or printers, you might lose the ability to easily discover those devices on your network. However, for gaming, this is typically not an issue.
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Performance: Disabling unnecessary services and drivers can sometimes help improve performance slightly, especially if your PC has limited resources. If the driver isn't contributing to your use case, disabling it might help free up some system resources.
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Stability: Disabling the driver should not cause any instability in system performance, particularly for gaming.
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Configuring Games: Most online games don’t rely on Link Layer Topology Discovery for their operations. So, turning off the driver should not affect your online gaming experience.
If you decide to go ahead, make sure to monitor your system for any unexpected behavior or issues, and you can always re-enable the driver if you find that you need it for some reason.