Response Time vs Uptime: Measuring What Users Actually Feel
Your dashboard says 100% uptime, but customers are complaining the site is slow. Both can be true. Uptime and response time measure different things, and you need both to understand the experience you're actually delivering.
Uptime: is it working?
Uptime answers a yes/no question — did the service respond correctly? It's essential but blunt: a page that takes eight seconds to load still counts as "up."
Response time: how fast?
Response time measures how long the server took to respond — the difference between a site that feels instant and one that feels broken even when it's online. Slow responses cost conversions long before a full outage does.
The "degraded" state
Treat "slow" as its own status. Set a response-time threshold — say 1,500ms — above which the monitor flags the service as degraded. That's your early warning that performance is sliding.