I'm having input lag issues as well.
It's not network related at all (20ms ping, no jitter, no packet loss, not on wi-fi), not sure if only after first goal.
Several people are having issues also, and yet it has not been acknowledged by EA in EA SPORTS FC Tracker neither in [INFO - PLEASE READ] FC 26 - Key Threads & Hot Topics | EA Forums - 12605014 .
Non-network related input lag complains I have filtered so on:
https://www.reddit.com/r/EASportsFC/comments/1nks802/insane_input_delay/
https://www.reddit.com/r/EASportsFC/comments/1forr4i/eafc25_pc_performance_fix_nvidia/
https://www.reddit.com/r/EASportsFC/comments/1nkr2et/fc26_pc_delay_players_feel_like_their_on_ice/
Game is unplayable on pc | EA Forums - 12605853
FC on PC needs to be remade | EA Forums - 12605409
pressing RT to sprint brings up the ea app overlay-EA please read and address | EA Forums - 12604985
pressing RT to sprint brings up the ea app overlay-EA please read and address | EA Forums - 12604985
Input lag EA FC 26 on PC | EA Forums - 12601288
Immense Input Delay only when playing against players | EA Forums - 12600785
Framelag e Delay | EA Forums - 12605952
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What I have perceived personally, is that the social overlay REALLY lags the game once any notification comes up, an there is no way to fully disable the overlay, only notifications. Also there is that pressing RT to sprint brings up the ea app overlay-EA please read and address | EA Forums - 12604985
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Later on I'm going to make a spreadsheet with all the ones I can find, so maybe, just maybe, we can be heard.