Why a website can be slow without being down

Identify which phase is slow. A delay before any content appears points toward DNS, connection setup or server response time; fast text followed by late images or controls points toward a specific asset, API or delivery path. Compare the same device on another network and another device on the same network, then record the exact URL, timestamp, timezone and visible error. A fast general speed test does not rule out a route-specific problem, and repeated refreshes can add load without producing better evidence.