RMBP caps lock button doesn't always work

I have noticed this too, I dont know if it is by design or not?

 

I haven't got an rMBP, but from how you are describing it by pressing when typing fast, that sounds like any Mac. They are designed so that the caps lock does not come on if you accidentally press it lightly while typing.

 

I´ve had this since v 10.4 Tiger, compared to other OS´s you have to press the button a little longer...
it has to be by design

 

This was already the case with the older Macbooks. It's by design, so you do not accidentally do not hit key during typing. When I got my first Macbook three years ago I was also a little worried at first. You get used to it!

edit: too slow...

 

shift and caps also works

 

When Apple introduced this a while ago, lots of people complained that the Caps Lock button did not work, unless you pressed it hard.

Another innovation that is so genius, it's actually doubted.