What loading time would a hierarchical tree with 800 items and 5 levels deep have?
In my java application, an old open source dhtmlxtree control takes me more than 15 seconds
This is a pretty large dataset, which may take much time for the rendering.
In this case I can suggest you to use the autoload feature:
You may try to test the performance itself in your local example using a script to generate a needed dataset. Something like:
https://snippet.dhtmlx.com/9m8lvyxx