Which of the following components MOST likely will provide performance improvement by using an add-on card compared to the on-board component?

Discrete GPU add-on cards are significantly more powerful than integrated (on-board) GPUs, offering substantial performance enhancements for gaming, video rendering, and other graphically intensive applications.

Add-on USB cards primarily provide additional ports or newer USB standards, but generally offer negligible performance improvement over existing on-board USB ports of the same standard.

While an add-on Wi-Fi card might offer newer standards or better antenna placement, leading to improved connectivity, the core processing performance boost is not as dramatic as with a GPU.

The CPU is a core component socketed onto the motherboard; performance is improved by replacing the CPU itself, not by adding a separate 'CPU card' in the same manner as a GPU.