It's not because your computer is slow or fast. If you go directly to the link of the level ( http://bonuslevel.org/games/game_puzzle-it_142.html#lvlid_29132 ) it'll be 8. If you play it while you were playing some other levels before it'll be 9.
I noticed the glitch. If your computer is a bit slow (happens from time to time) then the countdown starts from 8 because the first one is immediately counted while opening the page. Yeah, I think OMG is right. It has nothing to do with skills or challenge.
I'm sorry but I disagree. Levels that require a glitch to score on or to have the lowest score on should be edited and the glitch fixed because it is not really a puzzle.