A developer must troubleshoot to pinpoint the causes of performance issues when a custom page loads in their org. Which tool should the developer use to troubleshoot?

AppExchange is a marketplace for pre-built Salesforce applications and is not a development tool for troubleshooting performance issues.

Salesforce CLI is a command-line interface used for source control, deployment, and running tests, but it does not provide real-time profiling or detailed performance logs for page loads.

Visual Studio Code IDE is an integrated development environment used for writing and deploying code, but runtime performance monitoring and detailed debugging within the Salesforce environment are primarily handled by the Developer Console.

The Salesforce Developer Console provides essential tools such as debug logs, performance profilers, and a query editor, which are crucial for identifying and troubleshooting performance bottlenecks in custom pages and Apex code.