Editing my CVARS.xml (game config) and setting from "force_enable_multi_threaded_render_submit" value=0 to "force_enable_multi_threaded_render_submit" value=1 Resolved the poor GPU usage and hence the poor performance/lag/stutter. However it caused the flickering textures people are talking about below. Whatever this setting controls is likely related to whatever is causing this bug. Please fix this bungie!