FPSLimit = 70
FPSMax = 1

function onClientResourceStart ( resource )
    if ( guiFPSLabel == nil ) then
        FPSLimit = 255 / FPSLimit
        guiFPSLabel = guiCreateLabel ( 0.003, 0.983, 0.26, 0.1, "FPS: 0", true )
        guiSetFont (guiFPSLabel,"clear-normal")
        FPSCalc = 0
        FPSTime = getTickCount() + 1000
        addEventHandler ( "onClientRender", getRootElement (), onClientRender )
    end
end
addEventHandler ( "onClientResourceStart", getRootElement (), onClientResourceStart )

function onClientRender ( )
    if ( getTickCount() < FPSTime ) then
        FPSCalc = FPSCalc + 1
    else
        if ( FPSCalc > FPSMax ) then FPSLimit = 255 / FPSCalc FPSMax = FPSCalc end
        guiSetText ( guiFPSLabel, "FPS: "..FPSCalc)
        guiLabelSetColor ( guiFPSLabel, 255 - math.ceil ( FPSCalc * FPSLimit ), math.ceil ( FPSCalc * FPSLimit ), 0 )
        FPSCalc = 0
        FPSTime = getTickCount() + 1000
    end
end