Nc: searches have become slow

Searching with an nc: term has become slow in Anki 2.1.37. On two different collections, a search can take 2 or 3 seconds with 100% CPU utilization. When trying the searches again on 2.1.36 there is no perceptible delay.

I suspect you missed the ‘Optimized builds’ section of docs/

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Indeed I had. Sorry for the noise.