In another SEO Office Hours recording from January 2020, Google highlighted that JavaScript redirects do take longer to process than server-side redirects. You can watch that video here.

If you want to install JavaScript in VSCode, install Visual Studio Code & Node.JS, create and run a JavaScript program, and then take these steps.

All you have to do is right-click on a bookmark bar, choose Add page, and (1) enter the title. The JavaScript itself gets pasted into the URL field (2).

Use proper link markup. Do not use fragments to load different content in single page apps. Build websites that work well with JavaScript and the links will be found.