You're using a modern JavaScript module, but you haven't specified how it should load. By default, modules are deferred, but it's a good practice to be explicit. If the module can run independently, adding the `async` attribute can sometimes improve performance by allowing it to execute sooner.
<script type="module" src="/js/app.js"></script>If the module doesn't depend on other scripts and its execution order isn't critical, add the `async` attribute to it.
<script type="module" src="/js/app.js" async></script>While modules are deferred by default, explicitly adding `async` can allow the browser to execute the script as soon as it's downloaded (if the main thread is free), which can be faster than waiting for the entire document to be parsed.
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