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.
surveyjs.io
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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.
there's a lot of tricks like using "content-visibility: auto" to improve rendering performance introduced in chrome 84, lazy loading on scroll to reduce DOM elements, using "will-change" property to improve CSS animations perf + using only transforms/opacity in transitions, using images instead of large SVGs, calling removeEventListener on elements leaving the viewport...... and a lot more. web.dev articles is a great place to start.
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