Lots of lag in my script?

Hello guys and i have a simple brick that fades away when touched, and fades back. The fade part works fine, but there is a 2-3 second delay until it changes the canCollide

script.Parent.Touched:connect(function(hit)
    if hit.Parent and hit.Parent.Humanoid then

    for i=10, 0, -1 do
        script.Parent.Transparency = script.Parent.Transparency + 0.1
        if script.Parent.Transparency == 0.9 then script.Parent.CanCollide = false break end
        wait(0.1)
    end

    wait(2)

    for i=10, 0, -1 do
        script.Parent.Transparency = script.Parent.Transparency - 0.1
        if script.Parent.Transparency == 0.1 then script.Parent.CanCollide = true break end
        wait(0.1)
    end

    end
end)

Any help is appreciated.