Slowness while working on a large Pizzicato score?

Pizzicato contains an UNDO function (cancels the last operation). This implies that Pizzicato creates a copy of the measure you work each time you modify it. It is very fast and does not impede working. But when you work a very large document and execute some global operations (page layout, adding/erasing measures and staves...) Pizzicato must create a complete copy of your document, which can slow down the reaction time of Pizzicato. If you experience such a slowness, especially with an older computer, you may temporarily disable the UNDO function, through the Options menu , Global options item , at least during the global manipulations of the document.