For what this delay?

if love.timer then love.timer.sleep(0.001) end

Without this FPS is up.

Without sleeping between updates, the system will keep computing them as fast as possible, needlessly using up CPU time.
Even with the above 1ms sleep, a game can produce several hundred FPS.
You can probably get a more detailed answer on the forums.
~hryx 07:40, 16 January 2014 (CET)

Thanks, Hryx. --Antoniomoder (talk) 04:08, 20 September 2015 (CEST)