Run it
Copy the script and paste it into your executor.
local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")
local speedMultiplier = 2
humanoid.WalkSpeed = humanoid.WalkSpeed * speedMultiplier
[[local speedmultiplier = 1 and 100000 ]]code simple walkspeed

Universal