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To achieve optimal performance when connecting a non-wireless printer, using a USB connection is the preferred method. USB connections provide a direct, wired link between the printer and the computer, resulting in faster data transfer speeds and more reliable communication. This is especially important for tasks that involve printing large documents or graphics where quality and timely output are critical.

In contrast, while Bluetooth, Wi-Fi Direct, and Ethernet connections offer their own benefits, they may not match the performance of a direct USB connection. Bluetooth, for instance, is designed for short-range communication and can experience interference or limited bandwidth. Wi-Fi Direct, although convenient for wireless setups, can introduce latency issues and depend on the quality of the Wi-Fi connection. Ethernet connections, while generally reliable and faster than Wi-Fi, may not be an option for all non-wireless printers that don't have Ethernet ports.

Therefore, the USB connection stands out as the most efficient and trouble-free method for connecting a non-wireless printer, ensuring consistent performance and print quality.