Quoted from delt31:The key to having lag free (or not enough to see) is NOT to buy a 4k tv but a 4k monitor.
There are a lot of tests out there on these and the one I ended up getting was amazing where I didn't notice any lag. That's the way it needs to be. You shouldn't have to compensate for anything otherwise it wouldn't be worth it to me
Do you have a link to what you bought? I have a virtual machine as well, but still have a 1080p TV, looking to add 4k this fall.
Like others have said for VPX lag, graphics, playability have come a long way in the last little while. Still i think of them as a video game as emulating real pinball, not the same as real but still can be very fun. The FX3 Williams tables have come along nicely, I tried some beta testing and tables physics are getting better IMO.