So, I have now managed to "fix" the problem for me twice but I'm still not sure how exactly :D. So I will just put all I did in here and maybe it can help someone else reach a fully working solution.
I had the same problem as others - all smooth in offline modes but in online modes there is a noticeable (0,5s) delay in all actions. And it feels different from regular ping related delay. Ping related delay often slows down gameplay and then speeds it to "catch up". But the delay I have encountered is just a smooth delay that, as others have said, seems to slowly worsen the longer you play. So while it might seem manageble at minute 10, it will be unbearable by minute 40.
I troubleshot my internet for several hours but all seemed fine (ping 8-10ms) and performance was smooth in other games. So, after trying out all logical things, I went to the illogical ones.
For some reason EA FC24 says my monitor is 60Hz with no possibility to change it (it actually is 144Hz and recognized by all other games as such, including previous FIFAs). But frame rate was set at 120FPS by default. So I changed it to 60FPS and voila! Performance was smooth and it was night and day difference compared to how it was. You could feel from the start of the game that it's a completely new experience. Played a second game and exactly the same thing - everything perfect. I then went and changed the FPS back to 120 and input delay came back in online mode. It's not even just input delay but some weird overall stuttering that's difficult to explain.
I was now sure I had found the root cause (screen Hz and FPS didn't match) but when I changed the FPS back to 60 the delay was still there. I restarted my computer but nothing - still delay. I then tried to disable the Playstyle icons as suggested in an earlier post but still nothing.
But then I went and changed the game mode to Windowed borderless and FPS to unlimited and delay was gone again. I have now played 3 games in a row like this and all works amazingly.
Is it possible all the changes I have done have nothing to do with the performance and it has just been server related luck? Possibly. But the "type" of the delay and level of coincidence tells me that it's more probably related to some video settings.
As I have now spent app 5h troubleshooting the game I don't want to test anymore. I'm selfish and want to play the game (because if you get rid of the delay, it's fricking brilliant). So I put this info out here for others. Maybe others can do some similar tests and someone will figure it out fully.
TL;DR - mess around with your video settings
you are the best person in the fgging world i own you my life
