Werk #15098: setup form page rendering stuck when page has lots of select boxes

Previously, when a HTML form page was rendered with a lot (>hundreds) of select boxes, the augmentation process to make them searchable was taking a very long time.

Until a proper fix for this performance problem can be found, we now prevent the augmentation process whenever it would take more than 3 seconds.

The user-interface is almost not affected, only the select boxes are no longer searchable. No manual action of the user is necessary to make this work.

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