Why does my fps drop when there is alot of vgui controls on my menu?

[Bloom_]

I made a hack with multiple features such as checkboxes, sliders, combo boxes, buttons, text entry, labels.
When I go to the rage tab which is mostly filled with these features I drop about 100 fps.
I get the features by adding the function to the property sheet tab.

Example:

local function AddSlider(Parent, Text, X, Y, W, H, Min, Max, Decimals)
	local Slider = vgui.Create("DSlider", Parent)
	Slider:SetPos( X, Y )
	Slider:SetSize( W, H )
	Slider:SetText( Text )
	Slider:SetMin( Min )
	Slider:SetMax( Max )
	Slider:SetDecimals( Decimals )
end

local function DrawFrame()
	local Frame = vgui.Create( "DFrame" )
	Frame:SetPos( 100, 100 )
	Frame:SetSize( 300, 200 )
	Frame:SetTitle( "My new Derma frame" )
	Frame:SetDraggable( true )
	Frame:MakePopup()
	
	AddSlider(Frame, "Slider", 20, 20, 140, 10, 0, 100, 2)
end

DrawFrame()