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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Learn how to bundle your dependencies. You've got jQuery, OpenSeaDragon, Popper and Bootstrap all imported via CDN. If you try to pull these through a build tool and properly tree-shake your dependencies to only include the resources that you actually use, you can reduce your js bundle size drastically. In addition to this, if you're not using everything Bootstrap has to offer, you can also use tools like SASS to only include the styles you need for your site.