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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.
should be all backwards compatible. https://github.com/pmndrs/react-three-fiber/blob/master/markdown/changelog.md#600
this is complete bs though, he merely removed the stress from the stress-test, the very thing it's testing against. the updated test is here: https://github.com/drcmda/scheduler-test it includes the stress test (500 instances of text geometry), re-created every 2 sec. simply creating them takes 1-2 seconds. svelte, like everything else is going to choke on this. react on the other hand can balance load.