These all sound like things that benefit heavyweight desktop environments and don't really impact tiling window managers at all. I use DWM, no graphical glitch

These all sound like things that benefit heavyweight desktop environments and don't really impact tiling window managers at all. I use DWM, no graphical glitches, no tearing, no jankiness, absolutely consistently quick (which actually kind of removes "smoothness" from the equation; everything is pretty much instantaneous). Scrolling a document in Chromium very rarely pauses, but only ever when there's some bad JS blocking the UI, which isn't related to the window manager at all.