BodyPosition is laggy when its about to end, how to fix?

    local bodyPosition = Instance.new("BodyPosition")

        bodyPosition.MaxForce = Vector3.new(math.huge, math.huge, math.huge)

        local pos = char.HumanoidRootPart.Position

        local keysPos = {
            ["W"] = char.HumanoidRootPart.CFrame.LookVector,
            ["A"] = -char.HumanoidRootPart.CFrame.RightVector,
            ["S"] = -char.HumanoidRootPart.CFrame.LookVector,
            ["D"] = char.HumanoidRootPart.CFrame.RightVector
        }

        local keysPos2 = {
            ["W"] = "w",
            ["A"] = "a",
            ["S"] = "s",
            ["D"] = "d"
        }

        print(dash, keysPos2[dash])

        pos += keysPos[dash] * 10

        bodyPosition.D /= 2

        bodyPosition.Position = pos

    bodyPosition.Parent = char.HumanoidRootPart

        wait(0.75)

        bodyPosition:Destroy()

        char.Humanoid.WalkSpeed = 16

http://gyazo.com/7f865db68b0e39093e913c0c9d53bcdf

This is a script in an event. The bodyposition is a bit laggy most of the time when its about to end. How do I resolve this?