Open excel very slow if uses zoom 75%

[Eco]

One user reports that she opens an excel file very long time. I've checked
that excel file has only 4 worksheets with no picture but have a lot of data
record and save with 75% zoom. When I save worksheets with 100% zoom
default, it can be opened quickly. If save it in 75% zoom, it will be opened
very long time. The speed is not be acceptable. ( Like computer freeze for
long time)

(computer: Excel 2000 + Win2k Prof.)

How can I solve this problem if a user want to save worksheet with zoom 75%
in default. That she wants to open it with zoom 75% already?

Thanks.