Those are interesting numbers. Going to tell you that I don’ use add_row() and delete_row(). I’ve only every created a repeater that has a couple hundred entries once.
Most of the time when I’m updating a repeater I update the entire repeater using update_field(). Basically I generate all the rows of the repeater.
$repeater = array(
// each nested array is a row
array (
// each row is made up of field_key value pairs
'field_XXXXXXX' => 'field value',
'field_YYYYYYY' => 'field value
)
);
once the repeater and all rows are created I call update field on the repeater
update_field('field_ZZZZZZZ', $repeater, $post_id);
Not sure if this is something you can try or not.
