Manufacturers generally use the response time as the performance index for dynamic image sharpness. However, there is no uniform response time measurement or numerical definition method in the industry, and each manufacturer use different standards to make claims in retrospect of their product’s response time. Therefore, any stated response time may differ in comparison to the perceived experience from a gamer's point of view.
A TN panel's fast response time comes from its special liquid crystal material characteristics, which provides a clearer and sharper dynamic image quality compared to other LCD panel technologies. The video below compares the XL2546K (240Hz) with an IPS 240Hz monitor. In the video, both monitors are set at the fastest setting to test the response time. Overall, you can see that the TN panel provides a faster performance in-game due to it's characteristics.