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speedtest
Component to perform network speed tests against Cloudflare's edge network (by cloudflare)
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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.
Followup: I just tested OpenWrt 23.05.2 + luci-app-sqm + cake with https://speed.cloudflare.com/
With the limit set to 1 Mbps (1000/1000), my upload latency dropped from 80ms to 25ms, but speed was hard-limited to 1000/1000. With the limit rasied to 1G/1G, cake stopped working and my upload latency returned to 80ms.
So I stand by my original comment. You still have to configure the speed limits manually.