Why is OpenOffice slow?

[Arjun Shankar]

Okey, I didn't really bother about this till I saw OpenOffice running
on Windows machines at the place where I train. OpenOffice works
REALLY slow on my notebook (running only Ubuntu, so I can't really
compare, how it is on other operating systems myself), but it's
reasonably fast on those windows machines, which arent really all that
'better' than my litle piece of computing power.

So why is it that something thats open source is faster on a non-free
platform, than one thats free?

I know this isn't exactly related to ubuntu; still...

Arjun Shankar