Y'know... that little "K" abbreviation on the end is a pretty important detail. I skimmed the article about three times, thinking to myself: "600 users... Really? Big deal."
It wouldn't hurt to actually emphasize "600,000" by explicitly expressing all of the zeroes.
"That little K abbreviation" is kind of a common thing... I'm not sure what your experience is, but in order to understand a lot of what gets discussed on the web in terms of performance, you'll need to improve your attention to detail.
It wouldn't hurt to actually emphasize "600,000" by explicitly expressing all of the zeroes.