TOC alternatives to the official one

I am using the official table of contents on my Casper theme. It works great, but I noticed that it’s kind of big and takes a little bit more than the main body of the page to load most of the times, and I was wondering if there are other solutions. For example:

This is the official:

Official Table of Contents

This is the one on table of contents

How can I use this second one instead of the official one, since this one loads instantly and looks more beautiful?

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