How to display resource tree from 55000+ documents in ModX Evo?

Question

MODX

There is a site on ModX Evo 1.4.8, there is a resource tree, a parent folder is created in it, and 55084 resources are placed in it (all are published, but the display in the menu is disabled).
When logging into the admin panel, we get the following

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 106814386 bytes) in /***/manager/frames/nodes.functions.inc.php on line 382

What can be done about it?
EVO Version: 1.4.8
Release Date: Jan 09, 2019
PHP Version: 5.6.38 Database
Version: 5.7.18-14-log
Database Encoding: utf8
Database Mapping: utf8_general_ci Site_content
Table: Records: 55087 Footprint: 65.77 Mb
Switching to PHP 7.1 is not possible, and probably won't help either.

Answer 1

Yes, a dictionary would be helpful.
Look at the limits on execution time and used memory in the PHP settings.

Answer 2

kenwheeler.github.io/slick will do