Pasting objects takes a long time

[wesleybl]

When we are going to paste multiple objects into a folder, it is taking a long time. I see that the manage_pasteObjects method is called once for each object, inside a for:

plone.restapi/src/plone/restapi/services/copymove/copymove.py

Lines 82 to 85 in ae90f0e

	for parent, ids in parents_ids.items():
	result = self.context.manage_pasteObjects(
	cb_copy_data=self.clipboard(parent, ids)
	)

Doesn't this slow down the operation?

I see that in Plone Classic it is called only once:

https://github.com/plone/plone.app.content/blob/a61a7d2335b0d24b15cae9d9422b376a948177e6/plone/app/content/browser/contents/paste.py#L41

[ujsquared]

I see that the manage_pasteObjects method is called once for each object

I think it's for each parent instead of each object, which makes it similar to the Plone Classic approach.

[davisagli]

The code is grouping items by their parent folder, and then it does a copy (or cut) and paste once for each parent folder. I don't think it has a significant impact on the performance.

As far as I know, the largest reason pasting is slow is reindexing the items. I have a PR that I started a while back to make this faster for move operations, by only updating the indexes that actually change when an item is moved or renamed. (plone/Products.CMFPlone#3834). There were a few failing tests and I need to come back to it.