Similarly, the use of an IPS panel can be good and bad. The good news is that you get the wide viewing angles associated with IPS – and really, for a 34” display you’re going to want them! – but at the same time there’s a question of pixel response times, with most IPS panels rated at 5ms+ compared to TN panels rated at 1-2ms. LG specifies a response time of 14ms for the 34UM67, though they don’t mention whether that’s GtG or Tr/Tf. There’s also a setting in the OSD to improve response times, which we used to capture the following images with a 1/400s shutter speed. In the gallery below, we also compare the LG 34UM67 with the ASUS ROG Swift to show how the two panels handle the same content (from AMD’s FreeSync Demo).
My personal opinion is that LG's 14ms response time value may be incorrect, at least depending on the setting. The ASUS ROG Swift clearly has a faster response time in the above images and gallery, and if we compare best-case ghosting results, the “Normal” setting on the ASUS is very good while even the “High” setting on the LG still shows about two-thirds of the blades ghosting – I had some other images where the ghosting indicates the transition between frames occurs by the time around half of the display has been updated (~8ms). But the windmill in AMD's FreeSync demo is actually something of a best-case scenario if you happen to enable overdrive features.