IS_IN_DB() is a validator. Usually you need it to turn a foreign key to a human-understandable value, or to let the human select values from a set. Depending on your model and on the number of values available, generating the default widget in an edit form, which is an html SELECT, can take time, but if you really want that widget, there's not much web2py can do, because it needs to fetch those 10k records to let the human select the proper value. That being said, with 10k records, a SELECT is not appropriate, as you're forcing your users to skip through 10k records to choose what they want. I suggest you look into the autocomplete widget, or make your own ...
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