How to find out why a mapping has timeout?

To avoid having to use the shift key when getting to the command
prompt, I have this in my vimrc :

noremap ; :

I just switched over to a new machine with a fresh install of
Debian, and I'm finding the ; keypress is now subject to timeout...but
I can't figure out why. This was not the case on my old machine using
the identical vimrc. How might I go about finding why this behavior
is occurring?

TIA for any help,

John

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John Magolske
http://B79.net/contact

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