Was your sidebar open to to the tab with a completed-and-waiting-to-be-placed building visible, by any chance? That translucent overlay on the sidebar charge anim is a significant source of slowdown unless your sidebar is in system memory as opposed to vram.
Was your sidebar open to to the tab with a completed- and-waiting- to-be-placed building visible, by any chance? That translucent overlay on the sidebar charge anim is a significant source of slowdown unless your sidebar is in system memory as opposed to vram.