They have been putting some users through multiple challenges with a forced delay/throttling - so you need to actually answer 4 or 5 challenges with a minimum t

They have been putting some users through multiple challenges with a forced delay/throttling - so you need to actually answer 4 or 5 challenges with a minimum time per challenge of perhaps 5-8 seconds etc. These users appear to be Firefox users who sandbox Google cookies. That said, it seems to have improved a lot recently (only one challenge)