Reactivity tests
Here’s the concept in this test: A car moves from right to left at high speed. The movement isn’t perfectly fluid and depending on its speed, the car is shown in several successive positions. When this process is sped up, the car goes very fast, positions are very close and the eye perceives a fluid movement.
the perfect screen 
a screen with 2 afterglow imagesA monitor without ghosting effects would have previous images completely fading away when a new one appears. This is ideal, however in practice, it's often not the case as images progressively fade. Sometimes up to 5 afterglow artifacts remain on the screen representing the visible white trail behind objects.
We capture this LCD defect with a camera at a shutter speed of 1/1000 s by taking 50 pictures per test. We then can see a monitor’s ghosting effects, or the car’s position in the entire process from the moment when afterglow is at its maximum, up until when the next image is about to be created and the previous image is the least visible.
Here are the two extreme states between which each monitor’s afterglow can oscillate.
S-PVA 6 ms : Dell 2407WFP-HCLet’s go directly to results. There is strictly no improvement in reactivity compared to the previous version and this screen is not slower or faster that other PVAs or MVAs. On the other hand, even if it isn’t immediately obvious, the Iiyama ProLite B2403WS, a TN 3 ms, is slightly more reactive in games in clone mode side by side with this Dell. It’s very subtle, but if we had to pick a winner the prize would go to Iiyama.
But can we play fast games on this Dell 2407WFP-HC? It depends less on the screen, sufficiently reactive for us, and more on your graphic card because managing 1920 x 1200 pixels is very heavy.
To respond to an issue brought up in the forum: Is the 2407WFP-HC subject to a particular
ghosting or
bleeding, an especially poor RTC (overdrive), or even the display of ill-timed blue, green or red lines ? No, we didn’t note any of this. "Our" 2407WFP-HC showed entirely normal behavior and is, in our opinion, representative of screens found in stores. Or in other words, its display is identical – in terms of reactivity – to the previous 2407WFP.
Here is the reactivity of its main competitors :
S-PVA 6 ms : Dell 2407WFP
TN 3 ms : Iiyama Prolite B2403WS, with the OD set to 2
TN 5 ms : Samsung SyncMaster 245B
PVA 6 ms : Samsung SyncMaster 245T
P-MVA 8 ms : ViewSonic VX2435wm
TN 2 ms : Samsung SyncMaster 226BW S series
