The netcode since the update has been pretty garbage. The latest round I was in, it was as if players were teleporting on top of me and everyone's ping was normal. There were no triple digit pings and nothing over 70ms.
At one point, this was in Siege of Cairo breakthrough, we were trying to take the A objective in sector 3, which is the small court yard with the tiny garden and the small arched hallway. I had maneuvered towards the arched hallway, took a guy out, in it at the entrance to it, looked down the hall for any threats, it was clear, looked to the right into the garden for threats, it was clear, looked back down the hall and it was filled to the brim directly in front of me 3m, another to my left along the wall 6m, another behind in the middle about 10m, 2x more along the right arches about 12m for a total of about 5 to 6 threats in the span of 1 to 1.5 seconds just magically appearing.
There have been other cases of me checking corners, seeing it's clear and then all of a sudden I'm gunned down by a guy just standing there. Or I'm gunned down by a dude in a window who's been there all game but the game is just now showing registering it. It's been really bad in the new map.

S4 netcode been abysmal

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Been happening alot, but it seems to be baked into the game