[FabHK]

Sorry, as I keep saying in this thread, the excellent client-side password strength checking library zxcvbn (https://github.com/dropbox/zxcvbn) is under 400 kB compressed including dictionaries, checking against "30k common passwords, common names and surnames according to US census data, popular English words from Wikipedia and US television and movies, and other common patterns like dates, repeats (aaa), sequences (abcd), keyboard patterns (qwertyuiop), and l33t speak"

Thus, it is, as a matter of fact, quite possible to do reasonable password strength checking on the client side with a footprint that's a small fraction of many of today's ad-infested websites.