Stack Break Lab · Vercel

Field Reports

A small app that exercises the Vercel platform end to end and ships deliberately heavy image assets, so you can measure both feature reachability and load latency from mainland China.

Platform features wired into this site

Each maps to a probe in vercel-demo/probe/.

Static hosting / CDN Redirects & rewrites Custom headers Functions Edge Middleware Cron Jobs Blob KV

Latency lab

Raw static assets at different weights for manual latency testing (DevTools → Network, hard-reload to bypass cache).

Raw asset ~1 MB — 640×520 · ~0.95 MB
/assets/weight-1mb.png

Raw asset ~3 MB — 1024×1000 · ~2.9 MB
/assets/weight-3mb.png

Raw asset ~6 MB — 1414×1414 · ~5.7 MB
/assets/weight-6mb.png

Raw source 2400 wide — 2400×1600 · ~2.5 MB (source)
/assets/scene-2400.png

Stamp a report (Functions + Blob)

POSTs to /api/stamp-report, which writes and reads back a record in Vercel Blob.

Ping KV (Functions + KV)

GETs /api/kv-ping, which sets and reads back the china-probe key.