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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.
But I believe this is the library you were looking for: https://github.com/pdfme/pdfme. You can get the generation time down to 30-50ms for a 40kb pdf from scratch (probably less than 20ms since your tenants are just filling in the template).
You can install using `npm i json-to-pdf` or view the source on github
I don't understand what you mean with "direct" pdf creation so I'm maybe missing some point. I meant stuff like https://github.com/schibsted/jsx-pdf this for example. It's just the way the API can be used and you can build on top of it instead of just creating objects.