I've tested this last few days and the game is really using my entire Upload bandwidth on PVP modes. On average the game streams an Upload of 50-70 kbs. This is really high for ADSL users because the top speed for uploads in most cases is only 50 kbs max. If you hit the max upload speed your entire connection starts to slowdown and even videos from youtube start to buffer because of this. Not everyone has Fiber connections right now to play Destiny 2 and we really need some fix or workaround for this. Y tried on my phone connection via USB and with 1 MB upload the game didn't lag at all and it was a really good experience. Every time I try to play pvp with the ADSL connection is just so hard to register my shots sometimes and on my resources window from Windows I can see my upload speed maxed out from the game. Bungie can you find a workaround for ADLS users who have this problems? I'm sure I'm not the only one with a perfect stable connection.. no packet loss and really low ping having this latency issues just because of the high Upload speed required form the game for pvp.
Does your internet provider offer VDSL? Most vdsl subscribers have a 1mbps upload nowadays. Might be worth phoning your provider to inquire.