Last modified: 2014-02-28 16:41:20 UTC
The amount of latency is about 4-5s on my machine. Equivalent for regular thumbs is much lesser. Captchas are bad UX-wise, doubly so on a mobile phone (where i am on) and even worse when they are so slow.
Where was this tested? Some private wiki, some WMF wiki?
I've been testing it on testwiki.