getgenv().on = true -- on or off
getgenv()._global_walkspeed = 50 -- custom walkspeed 

local mt = getrawmetatable(game)
local oldIndex = mt.__index
local oldNewIndex = mt.__newindex

setreadonly(mt, false)

mt.__index = newcclosure(function(t, k)
    if not checkcaller() and typeof(t) == "Instance" and t:IsA("Humanoid") and k == "WalkSpeed" then
        return 16
    end
    return oldIndex(t, k)
end)

mt.__newindex = newcclosure(function(t, k, v)
    if not checkcaller() and typeof(t) == "Instance" and t:IsA("Humanoid") and k == "WalkSpeed" then
        return
    end
    return oldNewIndex(t, k, v)
end)

setreadonly(mt, true)

local RunService = game:GetService("RunService")
local Players = game:GetService("Players")

if getgenv().SpeedLoop then
    getgenv().SpeedLoop:Disconnect()
end

getgenv().SpeedLoop = RunService.Heartbeat:Connect(function()
    if getgenv().on then
        local character = Players.LocalPlayer.Character
        if character then
            local humanoid = character:FindFirstChildOfClass("Humanoid")
            if humanoid then
                humanoid.WalkSpeed = getgenv()._global_walkspeed
            end
        end
    end
end)

print("Xsaf, a love it")