I found https://caseyjkey.com/component---src-pages-index-js-16e07fb51b32a6d8779f.js takes a few seconds to load. What is this file, and what tools are available to help me optimize it?

When my first loads, the styling is not completely present. This is a React app, so I want to figure out what's taking a long time to load and try and display a loader until that is completed. I don't like the users seeing the site being 'built up' as it loads.

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