why are custom properties so fast?

[Sarah Reichelt]

> xbury.cs at clearstream.com wrote:
>> Did you try also with a hidden field?
>

I have now :-)
For the same test, hiding the field first brought the time down to 
about 500 ticks i.e. not as fast as just locking the screen.
When using the sub-stack, it made no difference.

BTW, in case anyone actually tries the tests and decided my computer is 
really slow, I actually did 500 repeats with fields and 5000 with 
custom properties :-)

Cheers,
Sarah