Your trick only creates an illusion of faster download, because the settings change makes your cpu busy, so it reads a larger block of time as "one second", so if your downloading 100kB/second, you might display 200, or 300kB/s, but your really looking at the download over the last 2-3 seconds, not 1second.
This is about as meaningful as me typing a large number here, and convincing yourself that it actually means something.
Some may read this as being a "bug", but if so, its more of a bug with the windows operating system then bitcomet, because all torrent clients can be tricked into displaying larger numbers if you confuse it with functions that overload your processes cpu time.
In other words, your not making anything download faster, and may in fact be slowing down your downloads, by overloading your cpu, making bitcomet unresponsive for a short time.