An I7-7700K is an old CPU by now and will get low FPS or lots of FPS variance in BF, it could be the cause of stuttering as well. Even BFV was pretty hard on 4C/8T CPUs. BF-games are notoriously hard on the CPU and with 128 players, things has been taken to a new level.
But like you I get a lot of "lag-issues", insta-deaths from all kind of weapons, getting killed around corners/behind cover, etc. The "netcode" of 2042 is really bad and for me it seems like the servers are struggling to handle the game. The worst part is that 64 player modes are just as bad as 128 player modes.
I'm personally getting really frustrated by the bad netcode and that cannot be solved by a faster CPU (I have a Ryzen 5800X).