Stop changing your sprite sheet to fix animation speed

An eight-frame animation does not have a fixed duration. At 8 fps it lasts one second; at 12 fps it lasts two-thirds of a second; at 16 fps it lasts half a second. Before drawing or generating more frames, check whether the problem is missing poses or the time each pose stays on screen. We maintain FrameSprite, a browser workspace for game assets. This is a timing and export note, not a claim that a particular frame count makes AI animation reliable. The equations work with hand-drawn sprites too. Three numbers that are easy to mix up Source FPS describes how a recording was sampled. Frame count is the number of entries you put in an animation. Playback FPS controls how fast those entries advance in the game. A 24 fps source video can provide eight selected poses that you play at 12 fps. You do not need to preserve every source frame. For equal holds, forward playback and a speed multiplier of 1: duration_seconds = frame_count / playback_fps frame_hold_ms = 1000 / playback_fps fps_for_target = frame_count * 1000 / target_duration_ms Same eight frames Hold per frame Full loop 8 fps 125 ms 1.000 s 12 fps 83.333… ms 0.667 s 16 fps 62.5 ms 0.500 s You changed the cadence without changing one pixel of the sprite sheet. A test you can reproduce Use the public eight-frame sample . Keep the same frames, order, canvas and pivot for all three trials. Change only playback FPS between 8, 12 and 16. Check the animation alone at its intended game size. Run it beside actual movement or attack timing. If cadence improves but a foot or weapon still jumps, inspect the missing phase instead of raising FPS again. If every frame jumps by a small amount, inspect canvas and pivot alignment. If the pause happens only at the seam, look for an accidental duplicate endpoint. The sample makes the arithmetic test repeatable. It is not evidence that eight frames is the right budget for every character or action. Do not accumulate rounded timestamps At 24 fps, one hold is 41.666… milliseconds. St