Speedtest — Ookla-style (Frontend) Speedtest — Premium Detecting device… — Mbps Start Stop Reset Mode Auto — streaming if allowed, otherwise guaranteed Accurate — streaming only (needs CORS) Guaranteed — no CORS (always works) Concurrency Duration (s) Test file (large, CORS-enabled preferred) Cloudflare 50MB (recommended) JSDelivr 10MB Download— Mbps Upload— Mbps Ping— ms