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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.
Anything in the milliseconds is pretty large for fast languages, so I think it could be something to do with the way that they sandbox submissions. Ultimately I dunno, but it is interesting to speculate how they do it, maybe some cheesed Linux containers like piston / https://github.com/engineer-man/piston or something. Heavily altered runtime could swing a few ms here or there, so that's the logic for not relying on Leetcode for accurate assumptions, I guess
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