NOTE: This might be a bug in the word processor and not the formula editor but
since the problem only arises in connection with formulas I think it's safer to
post it here.

In some cases OOO renders formulas extremely slowly. Sometimes I have to wait
for several minutes just to render a single formula. The cases are the following:

- when editing a formula inside a text document (updating auttomatically or
manually is slow)
- when pasting a formula from the clipboard into a text document
- when opening a document and showing a formula for the first time (and when
scrolling through the newly opened document for the first time)

In the following cases the formulas are rendered *much* faster:

- when editing a formula which is not a part of a text document (using
File->New->Formula)
- when scrolling through a document whose formulas have been rendered recently
(the first time I scroll through a document containing many formulas it is
extremely slow, but the second time it is much faster)

My CPU is an AMD K6-2 450 which isn't exactly state-of-the-art, so people with
modern CPUs might not be able to see hust how slow the rendering is using the
exaples presented here. For those people I recommend using more complex formulas
or slower computers.

Examples:

1. Select "File->New->Text Document". Then select "Insert->Object->Formula" and
enter the following formula:

left ( stack{a_1 # a_2 # a_3} right ) times left ( stack{b_1 # b_2 # b_3} right
)  = left ( stack{a_2 cdot b_3 - b_2 cdot a_3 # a_3 cdot b_1 - b_3 cdot a_1 #
a_1 cdot b_2 - b_1 cdot a_2}  right ) = left ( stack{a_1 # a_2 # a_3} right )
times left ( stack{b_1 # b_2 # b_3} right )  = left ( stack{a_2 cdot b_3 - b_2
cdot a_3 # a_3 cdot b_1 - b_3 cdot a_1 # a_1 cdot b_2 - b_1 cdot a_2}  right ) =
left ( stack{a_1 # a_2 # a_3} right ) times left ( stack{b_1 # b_2 # b_3} right
)  = left ( stack{a_2 cdot b_3 - b_2 cdot a_3 # a_3 cdot b_1 - b_3 cdot a_1 #
a_1 cdot b_2 - b_1 cdot a_2}  right ) 

2. Try copying it closing the formula editor, select your newly created formula
object, copy it and then paste it. You should notice how slow this is. For
comparison, select "File->New->Formula" and enter the formula above. You should
notice that this is ~10 times faster.

3. Open the attached document and scroll through it. You should notice how long
it takes to scroll through the document the first time (it takes several minutes
on my pc) compared to the second time you scroll through it.

BTW. I believe this could be caused by a bug in the word processor and not the
the fomula editor itself.