These people will tell you it's your internet, while your internet might not be great, D2 servers and connections are trash. I have 1gb fiber internet with up and down speeds up to 900mb/s, .49ms jitter, and 6ms ping but I experience teleporting and desync from adds and players in all facets of the game.
Flat out D2's network is garbage. Not a single other online connected game is even remotely as bad as this is. Bungaroni knows it's bad but can't or won't bother rebuilding dedicated servers. You'll have to endure the sh!t connection issues even with great internet.
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You should test your connection not so close to home...