NavigationTiming is an important schema that can reveal problems quicker. For example, Russian Wikipedia added an https redirect in their Common.js and their page load time increased dramatically.
Write a SQL query that grabs data which could be used to show this problem, then graph it so the information is easy to consume. Use this exercise as a way to brainstorm how to work with NavigationTiming in the future and how to make the useful data it gathers more easy to consume.