Ok.... I've got a late 2015 5k retina iMac and I've just bought a lovely 4k TV (Samsung 49KS7000), I wish to use the Samsung as an external display from the iMac if possible (mirrored or extended, doesn't matter).
I've currently got a Thunderbolt to HDMI adapter plugged into the iMac then a HDMI cable running from the adapter directly to the Samsung TV. This worked fine with my old 1080p screen but the Samsung TV has a massive amount of input latency. I notice the Samsung changes to 24p when I connect it to the iMac which is probably the cause of the latency I'm experiencing? If so is there a way to get the screen running at 60Hz instead of 24Hz?
I'm not sure about bandwidth limitations from Thunderbolt etc so I'm a bit stumped. I've tried changing the TV to 'game mode' and also tried labelling the HDMI input as both 'game console' then 'PC' neither of which had any effect on the issue.
Any help would be appreciated!