<b>The 99.9% uptime that's actually a brownout</b>

<b>The 99.9% uptime that's actually a brownout</b>

Myth: "My shared host is up, so I'm fine."

Uptime monitors ping a static health page. They don't measure CPU throttling. On oversold shared boxes, your account hits an invisible cgroup limit (often 1 vCPU equivalent) and your PHP processes get queued, not killed.

So the site "responds" at 11 seconds. Pingdom says 100% up. Google sees a slow LCP. Your monitor lies to you with a green dot.

Follow the money: the host sells you "unlimited resources" then meters the one thing that costs them money — CPU seconds.

Reality: uptime measures the door being open, not the room being on fire.