Dynamics 365 Performance Center is a tool available to troubleshoot performance. To use it, go to your Dynamics 365 instance in Internet Explorer.
Then press CTRL-SHIFT-Q. The window below will open. Press Enable:
Now, in another tab, select a record, e.g. an Account record. Press CTRL-SHIFT-Q again. You will see details on the load speed of the form:
Go to the Global Objects Count tab and Enable:
Reload the page and press CTRL-SHIFT-Q again. You will see details on the global objects: