I forgot to mention, the timer is independent of responsiveness of the application. If your computer is slow, you won't make it to 100% efficiency. Why? Because the Java app runs independent of the clock. So while your CPU is trying to compute the app the timer is ticking away, taking away precious time.
Sorry I didn't mention that before, it just came to my attention from a friend of mine.
Just figured this out on my own after quite some time of having fun making ridiculous carts but thinking I was retarded never being able to beat 24s/91%...switched to Firefox and my first run was 19s with a cobbled together PoS cart. Hmm.