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Glowroot

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description Glowroot Overview

Glowroot is a tool that analyzes website performance by measuring the time it takes for various resources – images, scripts, and stylesheets – to load, providing detailed insights into potential bottlenecks impacting page speed.

help Glowroot FAQ

Is Glowroot a browser PageSpeed tool or a Java application monitor?

Glowroot is an open-source Java APM agent, not a browser waterfall tool like Lighthouse or PageSpeed Insights. It captures slow requests, errors, SQL and service calls, response-time percentiles, profiles, and alerts. [Glowroot project](https://github.com/glowroot/glowroot)

How do I start Glowroot on one Java application?

Download the distribution ZIP, add `-javaagent:path/to/glowroot.jar` to the application JVM, and open the embedded UI at `http://localhost:4000`. Glowroot lists Java 8 or newer for the agent and Java 17 or newer for Glowroot Central. [Glowroot installation details](https://github.com/glowroot/glowroot)

When should I use Glowroot Central instead of embedded mode?

Embedded mode stores data locally with H2 and suits one application or a small install, while central mode sends agents to Glowroot Central and uses Cassandra for shared monitoring. In central mode, each application JVM needs a unique agent ID so separate metrics do not merge.

Can Glowroot show which image or script slows a landing page?

No, its core agent instruments Java server-side transactions and can show backend time in controllers, SQL, and service calls. Use Google PageSpeed Insights or Chrome DevTools for image, CSS, and JavaScript loading problems.

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