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It might not be a hardware issue, BF4 had a stack of Netcode issues that took quite a few updates to correct/improve.Saw a few youtube videos of Warzone highlights on Youtube today and there was rubberbanding, stutters and random connection related problems in all of the clips.
I stopped playing Warzone and Ground War as they are effected the worst. The servers just can't handle that amount of players and run smoothly at the same time.
The majority of players seem to be OK with piss poor servers and lag/stutters though so I doubt that better servers will be high on the devs "to do list".
I found that odd, too. Especially days before the release of Warzone...Yeah I remember BF4 was pretty bad when it was released, It actually took them years to get it up to par. Every BF game seem to be pretty bad the first few months after release tbh, but you're right BF4 was exceptionally bad at release.
Modern Warfare seemed fine to me before Warzone released though. I really think it's a combination of poor servers and bad netcode. Something seem to have change in the update leading up to Warzone beeing released imo.