I been using this software on and off for years now and speed has never been an issue.
To clarify it is not the product have you just setup a new dashboard app using one of the built in templates like multi page. And then run that. This should load super fast.
You must be trying to pull some data into your dashboard before it can display the components. If this is the case you should be looking at running the getting the data as a job then just returning the output of the job instead of trying to do some sql or ad query on the fly whilst loading your dashboard