Jargon used in Spider Slasher description

From the description of the Spider Slasher:

Unless someone has had at least some game development experience, they won’t know the default walkspeed amount or how slow 6 is for a speed. It should be communicated as “their speed is reduced to x% of their normal speed” so everyone can understand how much their targets are slowed down. The exact amount is 37.5%, but it’d probably be nicer to round up and say it slows them down to 40% of their normal speed, or modify the value it slows them down by to be a cleaner percentage of the default, 16.