How to stop Audacity from creating Envelope points?

In my current project, Audacity became awfully sluggish. I noticed that Audacity added envelope points in silent areas of several tracks, so I figure the points are causing the sluggish performance. Closing and relaunching the file did not help. My other *.aup3 files are fine.

Since it takes about 10 seconds to remove an unwanted envelope point, I’m in for hours of labor. Is there a way to stop Audacity from adding such points, and is there a way to remove multiple points in a selected track?

There’s a hack using Nyquist prompt code …

remove envelope

Ooh! That works nicely. Thank you.