The lag in the online play is making the game unplayable online, one second of input delay makes it impossible to play online. I searched as much as I could online for people trying to solve this problem, as well as what people did in PES 2015, which had the same problem, and what I could find was this,
you can try to:
1)Disable nagle's algorithm (you can google how to do it)
2)In your graphics card settings, set "pre rendered frames" from 3 to 1 (you can do it from the Nividia controller or for AMD you have to get Radeonpro)
3)Also in your graphics card settings, turn V-sync off (or to adaptive, again according to whether youre on Nivida or AMD)
4)Play in windowed mode (I know it makes no sense, and its not a graphics issue, but people kept saying to do it and when I did it helped)
My online play improved after I did those things, there is still lag of course, but now maybe its half a second not a full second... but still a lot better than before, first I couldnt even pass one ball, now I'm winning matches.
Still hope Konami would fix this whole thing with an update or something, Its really sad to see such an amazing game with such bad online play... If anyone knows of any other way to decrease the lag/delay time please let us know.