Glyphs gets stuck when I try to delete kerning

Every time I try to delete the kerning in an Glyph file to paste an improved kerning from another UFO, the program gets frozen for a looooong time. Is there a better way to replace the kerning without waiting such long times?

TIA

Have you tried File > Import > Metrics?

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How do you delete the kerning? From kerning panel?

Yes. I select all and delete.

Have noticed that too lately.
Months ago deleting kern pairs in the kern window worked much faster

Fixed it.

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