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System latency is another area of our testing, where we use Nvidia’s Latency and Display Analyzer Tool (LDAT) to measure end-to-end system latency. LDAT itself is a photosensor which is placed on the monitor. It has an integrated mouse button, allowing it to measure the total time taken from mouse click, to an action happening on screen, which is done by measuring a change in luminance. This data is logged to a CSV file over USB, allowing for close analysis of the data.
As this is end-to-end system latency, we are not measuring only the processing/input latency of each monitor we test. However, we can standardise the test process so the monitor is the only variable. It also gives an insight into how different refresh rates and resolutions can affect end-to-end latency, which is of course highly relevant to your purchasing decision.
We use Rainbow Six Siege for this testing.
Latency is no problem for the GM34-CWQ, with an average figure of 11.8ms. That puts it directly between the ~9ms latency we'd expect from a QHD screen, and the ~13ms of a 4K display, so that makes sense.
We can see the GM34-CWQ is almost twice as fast as the iiyama GB3466WQSU in terms of latency too, but that's more a case of the iiyama needing work, than it is the GM34-CWQ being super fast.
