René's URL Explorer Experiment


Title: fix(demo): preload the Cal.com booking embed while the visitor fills the form by waleedlatif1 · Pull Request #5616 · simstudioai/sim · GitHub

Open Graph Title: fix(demo): preload the Cal.com booking embed while the visitor fills the form by waleedlatif1 · Pull Request #5616 · simstudioai/sim

X Title: fix(demo): preload the Cal.com booking embed while the visitor fills the form by waleedlatif1 · Pull Request #5616 · simstudioai/sim

Description: Summary The demo page's Cal.com calendar took several seconds to appear after submitting the booking form: nothing embed-related (embed.js, the booker iframe, its assets) started downloading until the visitor pressed Continue Warm the entire path on first form focus using the embed's documented preload instruction — it caches the booker's assets in a hidden ?preload=true iframe while the visitor fills the form Add a preconnect to app.cal.com (React 19 react-dom API) so the first embed request skips connection setup Zero Cal.com traffic at initial page load, so Lighthouse/LCP are untouched; verified with Playwright — the calendar now finishes loading ~815ms after submit instead of starting cold Type of Change Bug fix Testing Tested manually with Playwright against the running app: confirmed no cal.com requests on page load, preload iframe attaches ~200ms after first form focus, and the booker renders fully ~815ms after submit Checklist Code follows project style guidelines Self-reviewed my changes Tests added/updated and passing No new warnings introduced I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Open Graph Description: Summary The demo page's Cal.com calendar took several seconds to appear after submitting the booking form: nothing embed-related (embed.js, the booker iframe, its assets) started downloading u...

X Description: Summary The demo page's Cal.com calendar took several seconds to appear after submitting the booking form: nothing embed-related (embed.js, the booker iframe, its assets) started downloadi...

Opengraph URL: https://github.com/simstudioai/sim/pull/5616

X: @github

direct link

Domain: github.com

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2eb01db fix(demo): preload the Cal.com booking embed while the visitor fills … waleedlatif1 Jul 12, 2026 https://github.com/simstudioai/sim/pull/5616/commits/2eb01db47376600426609fbb4eaa64933ad3b971
9e49846 fix(demo): retry embed warm-up on failure, preconnect only on first f… waleedlatif1 Jul 12, 2026 https://github.com/simstudioai/sim/pull/5616/commits/9e498460e15e466debb8c8122c2571b208626207
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