No TV is going to help with online latency (lag). There is a different kind of latency which is a delay between the video input signal being received, and it appearing on screen, which is known as input lag. Although Samsungs aren't the greatest for input lag, try connecting through input 1, and re naming it "PC". Many Samsungs have this feature, and it's better than game mode. It will help with the input lag. I find the game runs best for me outputting in 1080p@60Hz. If your PS4 video output is set to "automatic", that should already be in effect. I also go to the PS4 settings and turn off HDCP. Early PS4 software was causing video output problems in games with that feature turned on, so I just keep it off, unless I need to watch a blu-ray, or connect a video recorder.
If however, you are experiencing frame drops from online lag, you have some pretty severe online latency. I rarely see frame drops, and that is when viewing other player's killcams.
You need to do everything on your end to reduce online latency.
Make sure you are using a wired connection
Make sure you are getting Open NAT in game
Test your line quality on www.pingtest.net. You want a ping below 30ms, and a line quality grade of A-, or better.
If you are using a shared internet connection, make sure other devices that are connected to it are not hogging your bandwidth by downloading, streaming, skyping, etc.
Keep in mind your upload bandwidth is just as important as your download. I only get 5mbs down, but I also get 5mbs up. I almost always get picked as the host. On a different connection where I'm getting 20mbs down, and 2mbs up, I almost never get picked as host.
Another factor, and it's mostly out of your control, is the quality of the lines in your neighborhood, and what region you are playing in, and who you are playing with. All those will have a major impact on online latency, and if severe enough, you will get "frame drops" of the lag variety.
If the game is in fact so bad for you on PS4, try finding someone with it on XBONE and compare it for yourself. I find for me, it plays, and looks the best on PS4. It could be you wouldn't like it on any platform, but try checking everything I suggested, and see if it helps your gaming.
Good luck.