---
title: "Response Time Threshold Alerts — Lemwatch Help"
description: "Get alerted when response times consistently exceed your limits."
canonical: "https://lemwatch.com/help/response-time-thresholds"
source: "https://lemwatch.com"
---

# Response Time Threshold Alerts

> Get alerted when response times consistently exceed your limits.

## Response Time Threshold Alerts

 Set a per-site millisecond threshold. When response times exceed it for 2+ consecutive checks, you get a slow_response alert. Use this to catch performance degradation before it becomes downtime.

### Setup

 Go to **Edit Site** → **Advanced Monitoring** → set **Response Time Threshold** (e.g., 2000ms). Save. The threshold applies from the next check onward and does not affect historical data.

### How It Works

- Response time is measured on every uptime check across all monitoring regions

- 2 consecutive threshold breaches trigger an alert (single spikes are ignored)

- The alert is delivered through all channels configured on the site

- A recovery notification fires when response times return below the threshold for 2 consecutive checks

### Choosing a good threshold

 Look at your last 30 days of response time history in the Performance tab. Set the threshold at roughly your p95 — high enough to avoid noise from normal variance, low enough to catch real degradation. Marketing sites typically use 2000-3000ms; API endpoints 500-1000ms.

### Related settings

- Response degradation alerts — rolling-average baseline instead of a fixed threshold. Better for sites with variable traffic patterns.

- Performance budgets — page-level Core Web Vitals limits, separate from uptime response time.

### FAQ

 **Does the threshold affect uptime %?** No. The site is still considered "up" as long as it returns a 2xx status code. The threshold only controls the slow_response alert channel.

 **Can I set different thresholds per region?** Not yet — the threshold is global per site. Vote for it on the roadmap.


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