Value range Speed
9 or below Insanely Fast
10 to 20 Very Fast
21 to 25 Fast
26 to 30 Average
31 to 40 Slow
41 to 45 Very Slow
46 to 55 Extremely Slow
56 or higher Snail

Speed is a weapon and tool value that determines how long it takes for an item's animation to complete. Terraria's engine determines speed using the useAnimation value - one useAnimation increment equals one frame or 1/60th of a second. An item with a useAnimation of sixty is used in one second, or sixty frames with Terraria running at 60 frames per second (FPS). Running at 30 FPS, the same animation requires only thirty frames.

The useAnimation value ranges resulting in each speed are to the right.