private app access slow connection

How to Troubleshoot on private app access for slow connection or unaccusable applications for users (randomly) ?

We don’t have DEM advanced license .

What kind of tools or options do I have in order to troubleshoot on a slow connection to private apps?

I am familiar with :

1. The NPA Troubleshooter Tool
2. Export logs from the client when slowness for private applications occurs.