There was a case where there Dell 2417 H introduced lag when it was not running at native resolution . Just sayin ' www . tftcentral . co . ukreviewsdellu 2417 h . htmCorrection 16816 We ' ve had a few emails about the lag on the U 2417 H since we published this review , and comparisons with the measurement made atPCmagwhere they had used the Leo Bodnar device to measure a 10 . 2 ms total lag . We can ' t really comment on the accuracy or otherwise of that device , but something didn ' t seem right . We will hold our hands up here as it looks like we ' ve made a mistake with the lag measurements of this screen . The important thing is correcting that now , as we ' re sure it has an influence on people looking at buying this screen . Thanks to our friends atPcmonitors . infowho are currently testing the HA model with the same SMTT 2 . 0 tool we use we ' ve managed to figure out what has happened here and corrected our measurement results above . It seems that very unusually the U 2417 H shows an increased lag when nonnative resolutions are used on the screen . The scaling options in the OSD don ' t seem to impact it though . Our original measurements showed a total lag of 26 . 36 ms , with an estimated signal processing lag therefore as 21 . 81 ms in those circumstances . However , when running the screen at native res , the total lag was ~ 5 ms which is much better , giving a signal processing lag of only 0 . 45 ms basically nothing . We apologise for the confusion with the results previously published . To be honest , we ' ve not seen the lag vary like that before so it ' s an oddity which we will account for in the future as well .