raspberry

wait a minute...

if my CPU rate is low,the problem will appear.bot my CPU rate is high now...

I'm sorry because github doesn't allow .mp4 file so please unzip the following file and watch the video. (I know how to make it appear.open a new tab first!!!!!!) [vid.zip](https://github.com/google/recaptcha/files/4329611/vid.zip)

Oh I forget to tell you:there is a point.If I click on it,I can skip it.

I'll link to a new pull request later.