Responsiveness

This section usually three separated items:
1. Pixel response time.
2. Input lag.
3. Overdrive artifacts.

Some internet resources still provide pixel response time measurements. Some don't do so anymore because measurements may contradict visual impression.
In the other words, response time measurements should be taken with a grain of salt.
Practical user experience is all subjective.
The good news is that nowadays all monitors have pixel response time low enough for everything, including video and games. It's really hard to find an exception.

The 2490 is not an exception. More over, IPS technology is famous for being actually "faster" than PVA/MVA/TN when the same pixel response time listed in manuals.

Input lag. This "quality" (also subjective) is the least respected by the industry experts. But video games pandemic has become so vast that no review skips input lag evaluation now.

Formal input lag test (20-30 photos taken) reports 31ms input lag for the 2490. This is considered "standard" number for PC monitors. It's about 2 frames delay. This is normal for video and regular gaming.

The camcorder (as seen in supplement video) is able to catch just one frame delay.

Subjectively, input lag on the 2490 in direct comparison with a CRT monitor is minimal.

The 2490 has no artifacts of overdrive.
I wouldn't say that setting overdrive to On or Off makes any effect on the real picture.
Even with overdrive Off the 2490 is fast enough for any application with no overdrive artifacts guarantee.