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Its happening for me on a form which has worked fine on older versions.
Strangely, it seems to be an intermittent problem, sometimes a pice of code will run fine (about a second), other time it runs really slowly (about 2 minutes). This makes it hard to reproduce 😞
I'm running windows10 Pro (up to date) and see it on 32bit and 64bit versions of reader.
Thanks for reporting the issue. Can you please share more information so that we can debug it further: