Unworkably laggy

There’s a development: Now if I perform some operation Dorico doesn’t like, it just quits.
I had the project crash once when I was deleting a tuplet, and one minute later when I was moving from write to print to engrave too quickly.

Another time was right after I instered text with Shift+x. The text jumped all across the screen before the program crashed.

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Concave_convex 2.dorico (1.4 MB)