Speed issue

I ran into absolutely unbearable speed problems when working on a moderately long spreadsheet. It is named "samples to china". I can share it with customer support.

It has 141 rows and 3 columns.

When I select ALL and then picked a different font size, the browser simply freezes for 10-20 minutes. The font change WAS accomplished afterwards, but 10-20 minutes to accomplish such a task is absolutely unacceptable!

Similar things happen when I want to delete a number of columns together.

This really needs fixing. Thanks
cambridgemta