How to make Gui Tweens smooth, is it possible?

Here is the current script for tweening but Its not smooth animation it's just laggy. Wpuld interpolation help, and how would I do it? Thanks!

repeat wait() until script.Parent.Loading.Text == "100% Loaded"
if script.Parent.Loading.Text == "100% Loaded" then
	script.Parent.Loading.Text = "Loaded Sucessfully"
	wait(0.5)
	script.Parent.Box:TweenPosition(UDim2.new(2, 0,0.17, 0), "Out", "Bounce", 5, false)
	script.Parent.Loading:TweenPosition(UDim2.new(2, 0,0.17, 0), "Out", "Bounce", 5, false)
	wait(1.6)
	script.Parent.Backframe:TweenSizeAndPosition(UDim2.new(0.3,150,0.4,42), UDim2.new(0.3,0,0.4,-63))
	script.Parent.Frame.Visible = true
	wait(2)
	script.Parent.Box:Destroy()
	script.Parent.Loading:Destroy()
end

If you want it to Tween a bit better heres a Wiki link to show you all the ways you can Tween it and it also explanes it so your not left hanging.

http://wiki.roblox.com/index.php?title=API:Enum/EasingStyle