Folders tree pagination

[adminusername]

On folders with too many subnodes, the browser can not process the request.
In practice, when we select the parent folder, the tree opens,
if we select a sub-folder after a while the browser is frozen and on Firefox and Chrome a control is activated to block/continue the executing script that is not responding.
The situation occurs with folders with a high number of nodes starting from say 6/7 thousand and more.
We should introduce the pagination of the child folders on the navigation tree with a navigation control and in the administration section the possibility to specify the number of nodes (folders) for each page