Quick Answer
A 2ms response-time gap between 4ms and 6ms is modest and is rarely the deciding factor by itself. Pixel behaviour changes by colour transition and by overdrive mode, so look for visible ghosting and overshoot rather than treating one small quoted number as a complete verdict. The Lenovo L24-4e lists 4ms GtG in Extreme mode; that is a stated mode-specific figure, not a promise that every pixel change always completes in 4ms.
What response time describes
Response time is about how quickly a pixel changes from one shade to another. A faster change can reduce the trailing or blur you see behind moving objects. It matters when scrolling, moving windows, playing games, or watching motion, but it is only one part of the picture.
The GtG label means grey-to-grey. It describes a type of pixel transition rather than every possible move from black to white, colour to colour, or one shade to another. Different transitions can behave differently, which is why a single number cannot capture the whole screen experience.
Compare office monitors and gaming monitors by the motion experience you need, not only their headline figure.
Why 4ms versus 6ms is not everything
The numerical difference is 2ms, which sounds large when read as a percentage but is short in real time. A monitor's refresh rate, panel behaviour, graphics output, and the content you are viewing all affect what you actually see. A well-configured 6ms display can feel perfectly usable, while a poorly tuned faster mode can create distracting artifacts.
Overdrive is the setting that tries to make pixel transitions happen faster. Push it too hard and you may see overshoot, sometimes called inverse ghosting, where a bright or dark halo appears after a moving edge. The best setting is the one that keeps normal motion clear without creating obvious halos.
Test the screen with your own content
Open a scrolling web page, move dark windows across a light background, and play the sort of game or video you use most. Look for a long trail behind moving objects or a bright outline that was not in the original image. Do the test at the refresh rate you intend to use.
The L24-4e's product information quotes 4ms GtG in Extreme mode. Try the available picture settings calmly rather than assuming the most aggressive mode must be best. If normal scrolling looks stable and no unwanted halos stand out, the setting is doing its job.
Frequently Asked Questions
Is 4ms much faster than 6ms?
The 2ms difference is modest. It can contribute to motion clarity, but it should be considered with refresh rate, visible ghosting, and overdrive behaviour.
What is GtG response time?
GtG means grey-to-grey. It refers to a type of pixel transition, not every possible colour or brightness change the monitor makes.
Should I always use Extreme overdrive?
Not automatically. An aggressive mode can introduce overshoot. Pick the setting that gives clean-looking motion with the content you actually use.
Judge response time with your eyes and your daily workload, not one number in isolation.