Same issue. Sometimes takes a little while longer, sometimes happens within minutes of restarting game. Sounds about right that public events or something like that trigger it, though it's hard to be certain when exactly it starts because the issue is not detectable by observing your numerical frame rate and starts off small.
Things just start stuttering, a little at first, more as time goes by. When it gets bad it's certainly not comparably to what I'd call "microstuttering", it's game ruining. Restarting the game [b]always[/b] fixes the problem, so it's obviously some sort of a memory leak or similar issue.
6700k
16 gig DDR4
1080Ti Asus STRIX
Game and OS on Samsung 960 NVME drive
Win10 64bit, latest major version
1440p/144hz / Ultra settings / Gsync
I've tried:
-Changing all the graphics settings when issue occurs - does not fix. Nor does having lower settings prevent the issue from appearing.
-Vsync on/off, no help.
-Locking framerate to various values, both with ingame limiter and external tools.
-Checked temps, all is good.
-Removed all extra USB input devices such as gamepad and wheel.
-Killed all extra services and programs in Windows before starting game
-Updated all possible drivers for the GPU, motherboard etc. Updated BIOS.
-Checked that other performance hungry games still behave correctly - they do.
-Disabled other monitor before starting the game to make sure it was not a dual display issue.
-Used a different sound card.
I guess there's little point after that list in saying how annoying the issue is. All out of ideas and hoping for a fix soon. Thanks.
English
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I'm in the exact same boat. I've tried every single suggested fix from these forums and the Reddit compiled list. Nothing has worked. Aside from restarting the game, the only other method I found was to hook my PC up to my 60hz TV and play that way. Not what I had in mind for playing Destiny 2 on PC. My PC specs are the same as yours. Very, very frustrating, especially when we just want to enjoy Forsaken content.