TPS measurement

local pw=0
local pc=0
local sleepTime=1
if not os.getComputerLabel() then
        for i=1,60 do
                local s=http.get("http://timeapi.netii.net/index.php")
                pw=s.readLine()
                measure=1000/((pw-pc)/20)
                if measure<19 then
                        sleepTime=sleepTime-0.01
                end
                pc=pw
                print(sleepTime)
                sleep(sleepTime)
        end
        os.setComputerLabel(tostring(sleepTime))
else
        sleepTime=tonumber(os.getComputerLabel())
end
while 1 do
        local s=http.get("http://timeapi.netii.net/index.php")
        pw=s.readLine()
        ticks3=1000/((pw-pc)/20)
        shell.run("clear")
        print("Current tps:"..tostring(ticks3))
        pc=pw
        sleep(sleepTime)
end