I have been using this plugin for quite a long time now on a server with a playercount of around 150 - 200 at any given time. and have noticed that the plugin seems to have a very long hook time which seems to be contributing FPS reduction.
Is it possible you can optimize this plugin by reducing how frequently it serializes CUI objects into JSON?
(Example of optimization; https://umod.org/plugins/limited-drone-range)