function round(num, numOfDecimalPlaces)
  return(string.format("%." ..(numOfDecimalPlaces or 0).. "f", num))
end
monitor = peripheral.wrap("top")
term.redirect(monitor)
c=0
dif=0
maxdif=0
sum=0
tickspeed = 0
while true do
  t=os.epoch("utc")
  sleep(0.05)
  dif=os.epoch("utc")-t
  sum=sum+dif
  if (dif>maxdif) then
  maxdif=dif
  end
  c=c+1
  if(c==20) then
  tickspeed = (round(1000/(sum/20), 2))
  tkspdnum = tonumber(tickspeed)
  if (tkspdnum <=20.5 and tkspdnum >=19.5 ) then
    term.setTextColor(colors.green)
  end
  if (tkspdnum >20.5 and tkspdnum <= 22.5) then
  term.setTextColor(colors.yellow)
  end
  if (tkspdnum >22.5) then
  term.setTextColor(colors.red)
  end
  if  (tkspdnum < 19.5 and tkspdnum >= 17.5) then
  term.setTextColor(colors.yellow)
  end
  if (tkspdnum <17.5) then
  term.setTextColor(colors.red)
  end
  print("tps:" .. tickspeed .. " longest tick:" ..  maxdif .. "ms")
  c=0
  sum=0
  maxdif=0
  end
end