VA usually has more input lag than TN, usually at least 1 refresh cycle input lag.
TFTCentral's lag results are VSYNC OFF biased (1000fps SMTT test) so they tend to produce lower numbers than other websites which uses things like Leo Bodnar (VSYNC ON biased lag test, 60fps). I would ignore the decimal digits ("4.89, round them off to the nearest millisecond.
Double-digit numbers is not unusual for 60Hz VA panels at all, unfortunately -- those are common numbers for VA.
If you look at an average VA panel on any lag-test website (like HDTVs tested by RTings/DisplayLag, or monitors tested by TFTCentral), you will see that many VA panels usually are laggier than TN/IPS too. TFTCentral utilizes some BlurBusters inventions for their tests and their lag results are more useful to CS:GO players than sites that use Leo Bodnar, because of the VSYNC OFF bias in their lag tests versus the usual VSYNC ON bias of most other lag tests (which is good for consoles).
We even
talk to other lag testing sites and understand the benefits & flaws of specific lag tests and
why lag test numbers vary between different websites. We're among the only few people in the world to articulate this very well, so you won't find much in Google except for us when it comes to nuances/subtleties/strangeness/differences in lag test numbers between websites.
The general rule of thumb is strobing adds a half a refresh cycle lag. 240Hz strobing only adds average 2ms lag, and 120Hz strobing only adds average 4ms lag.
And since it's an ON/OFF setting, the lag suddenly disappears when ULMB is turned to the "OFF" setting in the monitor's OSD menu. The clarity is, however, worth it in several games. For eSports CS:GO you may want the fastest 240Hz TN, but if you're concerned about beauty of IPS colors, with a good compromise in latency, image quality, and access to low motion blur, then listen very carefully to my words: "1440p 165Hz IPS GSYNC" -- and you'll get your DELL colors with low lag, and approx >50% less blur than your DELL (in non-ULMB 120fps material) or 90% less blur than your DELL (if you choose to turn on ULMB mode). And GSYNC fixing the stutters too (if you use GSYNC).
For CRT oldtimers but those who have never, ever seen strobing before, the magic of an LCD suddenly magically responding 10x faster when turning on a "ULMB" checkbox, is sometimes somewhat shocking improvement to motion blur (back in 2012,
see disbelieving "WOW" testimonials of the old-fashioned LightBoost. Back then, people were genuinely shocked that an LCD could match CRT motion clarity... We understand how it can be done (
high speed video of LightBoost that explains strobing can essentially
break the GtG pixel response barrier in a creative way). This YouTube video has been seen 250,000 times, and has long been the gold standard in explaining how a strobe backlight can hide most LCD GtG pixel limitations from human eyes. Now monitor manufacturers make strobe backlight features standard in many high-Hz monitors, for motion-blur-sensitive people. Some people don't care much, but other people really do -- and the subject line of this forum post is "
best low motion blur new monitor with good colors". So these links are mandatory reading for those people who still do not believe LCDs can approach CRT motion clarity via a strobe backlight mode (ULMB, LightBoost, ELMB, Blur Reduction, DyAc, or all the various trade names manufacturers now come up for darn nearly
exactly the same technique). We're the website that originally started up to design a strobe backlight, until LightBoost hacks were found, and now some manufacturers utilize our
Engineering a strobe backlight guide -- some monitors have a strobe backlight now because of us.
Or you could get a strobed VA monitor. Still, you're going to have unavoidable VA lag, they have tended not to be ideal championship-league eSports monitors due to that.
VA are nice panels for what they do, great colors, but let's put things in perspective -- blur reduction is an "avoidable" lag since it's an ON/OFF setting, and blur reduction lag is a smaller lag penalty than VA lag itself.