Bulk edit form with multi-valued fields causes item selection latency

Created a bulk edit form following the [HOWTO: Create a Bulk Edit Form|https://doc.nuxeo.com/nxdoc/how-to-create-bulk-edit-form-studio]

This form has 11 multi-value String[] fields. When selecting items in a Folderish document view where the bulk edit button is available, each selection takes about 3 to 4 seconds to finish selecting. If multi-selecting more than 20 items at once, the browser may hang or timeout.

This can be reproduced by defining a File based document type and adding at least 11 String[] fields to its schema. Then create a bulk edit form following the HOWTO. Navigate to a view where the button is active and add 20-30 documents of the created type. Select an item and note the time lag before the action toolbar appears. As you select additional items, a similar delay before the selection is completed occurs.