In L&D we've always had a problem with jerky movement. And most often when I see external complaints about BYOND games, it's about jerky movement.
Well for a long time I've meant to play with the new pixel_step_size feature, but I only just got around to it...
I tried this formula, and found it instantly removed significant jerkiness:
pixel_step_size = round(32 / ticks_between_movement)
Where ticks_between_movement is the delay your game has for allowing mobs to move between turfs.
There is still micro-jerkiness, and some directions or change of directions seem to fall into it a bit, but overall this seems much smoother. (In our case it would typically change the default 4 pixels to 5 pixels.)
Good idea! I'll have to try that out.